Trusted Platform Module Explained

Trusted Platform Module
Status:	Published
Version:	ISO/IEC 11889:2015
Organization:	Trusted Computing Group, ISO/IEC JTC 1
Abbreviation:	TPM
Domain:	Secure cryptoprocessor
Website:	,,,

Trusted Platform Module (TPM) is an international standard for a secure cryptoprocessor, a dedicated microcontroller designed to secure hardware through integrated cryptographic keys. The term can also refer to a chip conforming to the standard ISO/IEC 11889. Common uses are to verify platform integrity (to verify that the boot process starts from a trusted combination of hardware and software), and to store disk encryption keys.

One of Windows 11's operating system requirements is TPM 2.0 implementation. Microsoft has stated that this is to help increase security against firmware attacks.^[1]

History

Trusted Platform Module (TPM) was conceived by a computer industry consortium called Trusted Computing Group (TCG). It evolved into TPM Main Specification Version 1.2 which was standardized by International Organization for Standardization (ISO) and International Electrotechnical Commission (IEC) in 2009 as ISO/IEC 11889:2009.^[2] TPM Main Specification Version 1.2 was finalized on 3 March 2011 completing its revision.^{[3] [4]}

On 9 April 2014 the Trusted Computing Group announced a major upgrade to their specification entitled TPM Library Specification 2.0.^[5] The group continues work on the standard incorporating errata, algorithmic additions and new commands, with its most recent edition published as 2.0 in November 2019.^[6] This version became ISO/IEC 11889:2015.

When a new revision is released it is divided into multiple parts by the Trusted Computing Group. Each part consists of a document that makes up the whole of the new TPM specification.

• Part 1 Architecture (renamed from Design Principles)
• Part 2 Structures of the TPM
• Part 3 Commands
• Part 4 Supporting Routines (added in TPM 2.0)

Overview

The Trusted Platform Module (TPM) provides:

• A hardware random number generator^[7]
• Facilities for the secure generation of cryptographic keys for limited uses.
• Remote attestation: Creates a nearly unforgeable hash key summary of the hardware and software configuration. One could use the hash to verify that the hardware and software have not been changed. The software in charge of hashing the setup determines the extent of the summary.
• Binding: Data is encrypted using the TPM bind key, a unique RSA key descended from a storage key. Computers that incorporate a TPM can create cryptographic keys and encrypt them so that they can only be decrypted by the TPM. This process, often called wrapping or binding a key, can help protect the key from disclosure. Each TPM has a master wrapping key, called the storage root key, which is stored within the TPM itself. User-level RSA key containers are stored with the Windows user profile for a particular user and can be used to encrypt and decrypt information for applications that run under that specific user identity.^{[8] [9]}
• Sealed storage: Specifies the TPM state for the data to be decrypted (unsealed).
• Other Trusted Computing functions for the data to be decrypted (unsealed).

Computer programs can use a TPM for the authentication of hardware devices, since each TPM chip has a unique and secret Endorsement Key (EK) burned in as it is produced. Security embedded in hardware provides more protection than a software-only solution.^[10] Its use is restricted in some countries.^[11]

Uses

Platform integrity

The primary scope of TPM is to ensure the integrity of a platform. In this context, "integrity" means "behaves as intended", and a "platform" is any computer device regardless of its operating system. This is to ensure that the boot process starts from a trusted combination of hardware and software, and continues until the operating system has fully booted and applications are running.

When TPM is used, the firmware and the operating system are responsible for ensuring integrity.

For example, the Unified Extensible Firmware Interface (UEFI) can use TPM to form a root of trust: The TPM contains several Platform Configuration Registers (PCRs) that allow secure storage and reporting of security-relevant metrics. These metrics can be used to detect changes to previous configurations and decide how to proceed. Examples of such use can be found in Linux Unified Key Setup (LUKS),^[12] BitLocker and PrivateCore vCage memory encryption. (See below.)

Another example of platform integrity via TPM is in the use of Microsoft Office 365 licensing and Outlook Exchange.^[13]

Another example of TPM use for platform integrity is the Trusted Execution Technology (TXT), which creates a chain of trust. It could remotely attest that a computer is using the specified hardware and software.^[14]

Disk encryption

Full disk encryption utilities, such as dm-crypt, can use this technology to protect the keys used to encrypt the computer's storage devices and provide integrity authentication for a trusted boot pathway that includes firmware and the boot sector.^[15]

Other uses and concerns

Any application can use a TPM chip for:

• Digital rights management (DRM)
• Windows Defender
• Windows Domain logon^[16]
• Protection and enforcement of software licenses
• Prevention of cheating in online games^[17]

Other uses exist, some of which give rise to privacy concerns. The "physical presence" feature of TPM addresses some of these concerns by requiring BIOS/UEFI-level confirmation for operations such as activating, deactivating, clearing or changing ownership of TPM by someone who is physically present at the console of the machine.^{[18] [19]}

By organizations

The United States Department of Defense (DoD) specifies that "new computer assets (e.g., server, desktop, laptop, thin client, tablet, smartphone, personal digital assistant, mobile phone) procured to support DoD will include a TPM version 1.2 or higher where required by Defense Information Systems Agency (DISA) Security Technical Implementation Guides (STIGs) and where such technology is available." The DoD anticipates that TPM is to be used for device identification, authentication, encryption, and device integrity verification.^[20]

TPM implementations

TPM 2.0 Reference Implementation
Developer:	Microsoft
Programming Language:	C, C++
Genre:	TPM implementation
License:	BSD License

Laptops and notebooks

In 2006 new laptops began being sold with a built-in TPM chip. In the future, this concept could be co-located on an existing motherboard chip in computers, or any other device where the TPM facilities could be employed, such as a cellphone. On a PC, either the Low Pin Count (LPC) bus or the Serial Peripheral Interface (SPI) bus is used to connect to the TPM chip.

The Trusted Computing Group (TCG) has certified TPM chips manufactured by Infineon Technologies, Nuvoton, and STMicroelectronics,^[21] having assigned TPM vendor IDs to Advanced Micro Devices, Atmel, Broadcom, IBM, Infineon, Intel, Lenovo, National Semiconductor, Nationz Technologies, Nuvoton, Qualcomm, Rockchip, Standard Microsystems Corporation, STMicroelectronics, Samsung, Sinosun, Texas Instruments, and Winbond.^[22]

TPM 2.0 implementations

There are five different types of TPM 2.0 implementations (listed in order from most to least secure):^{[23] [24]}

• Discrete TPMs are dedicated chips that implement TPM functionality in their own tamper resistant semiconductor package. They are the most secure, certified to FIPS-140 with level 3 physical security^[25] resistance to attack versus routines implemented in software, and their packages are required to implement some tamper resistance. For example, the TPM for the brake controller in a car is protected from hacking by sophisticated methods.^[26]
• Integrated TPMs are part of another chip. While they use hardware that resists software bugs, they are not required to implement tamper resistance. Intel has integrated TPMs in some of its chipsets.
• Firmware TPMs (fTPMs) are firmware-based (e.g. UEFI) solutions that run in a CPU's trusted execution environment. Intel, AMD and Qualcomm have implemented firmware TPMs.
• Virtual TPMs (vTPMs) are provided by and rely on hypervisors in isolated execution environments that are hidden from the software running inside virtual machines to secure their code from the software in the virtual machines. They can provide a security level comparable to a firmware TPM. Google Cloud Platform has implemented vTPM.^[27]
• Software TPMs are software emulators of TPMs that run with no more protection than a regular program gets within an operating system. They depend entirely on the environment that they run in, so they provide no more security than what can be provided by the normal execution environment. They are useful for development purposes.

Open source implementations

The official TCG reference implementation of the TPM 2.0 Specification has been developed by Microsoft. It is licensed under BSD License and the source code is available on GitHub.^[28]

In 2018 Intel open-sourced its Trusted Platform Module 2.0 (TPM2) software stack with support for Linux and Microsoft Windows.^[29] The source code is hosted on GitHub and licensed under BSD License.^{[30] [31]}

Infineon funded the development of an open source TPM middleware that complies with the Software Stack (TSS) Enhanced System API (ESAPI) specification of the TCG.^[32] It was developed by Fraunhofer Institute for Secure Information Technology (SIT).^[33]

IBM's Software TPM 2.0 is an implementation of the TCG TPM 2.0 specification. It is based on the TPM specification Parts 3 and 4 and source code donated by Microsoft. It contains additional files to complete the implementation. The source code is hosted on SourceForge^[34] and GitHub^[35] and licensed under BSD License.

In 2022, AMD announced that under certain circumstances their fTPM implementation causes performance problems. A fix is available in form of a BIOS-Update.^{[36] [37]}

TPM 1.2 versus TPM 2.0

While TPM 2.0 addresses many of the same use cases and has similar features, the details are different. TPM 2.0 is not backward compatible with TPM 1.2.^{[38] [39]}

Specification	TPM 1.2	TPM 2.0
Architecture	A complete specification is intended to consist of a platform-specific protection profile which references a common three part TPM 1.2 library. In practice, only a PC Client protection profile was created for TPM 1.2. Protection profiles for PDA and cellular were intended to be defined, but were never published.	A complete specification consists of a platform-specific specification which references a common four-part TPM 2.0 library.^[40] Platform-specific specifications define what parts of the library are mandatory, optional, or banned for that platform; and detail other requirements for that platform. Platform-specific specifications include PC Client,^[41] mobile,^[42] and Automotive-Thin.^[43]
Algorithms	SHA-1 and RSA are required.^[44] AES is optional. Triple DES was once an optional algorithm in earlier versions of TPM 1.2,^[45] but has been removed from TPM 1.2 version 103.^[46] The MGF1 hash-based mask generation function that is defined in PKCS#1 is required.	The PC Client Platform TPM Profile (PTP) Specification requires SHA-1 and SHA-256 for hashes; RSA, ECC using the NIST P-256 curve for public-key cryptography and asymmetric digital signature generation and verification; HMAC for symmetric digital signature generation and verification; 128-bit AES for symmetric-key algorithm; and the MGF1 hash-based mask generation function that is defined in PKCS#1 are required by the TCG PC Client Platform TPM Profile (PTP) Specification.^[47] Many other algorithms are also defined but are optional.^[48] Note that Triple DES was added into the TPM 2.0 library, but with restrictions to reject weak keys.^[49] Also, elliptic cryptography Direct Anonymous Attestation (ECDAA) using Barreto-Naehrig ECC curves which was mandatory in earlier versions has been made optional in the PC Client profile version 1.59.
Crypto Primitives	A random number generator, a public-key cryptographic algorithm, a cryptographic hash function, a mask generation function, digital signature generation and verification, and Direct Anonymous Attestation are required. Symmetric-key algorithms and exclusive or are optional. Key generation is also required.^[50]	A random number generator, public-key cryptographic algorithms, cryptographic hash functions, symmetric-key algorithms, digital signature generation and verification, mask generation functions, and exclusive or are required by the TCG PC Client Platform TPM Profile (PTP) Specification. ECC-based Direct Anonymous Attestation using the Barreto–Naehrig 256-bit curve is optional for the TCG PC Client Platform TPM Profile (PTP) Specification. The TPM 2.0 common library specification also requires key generation and key derivation functions.^[51]
Hierarchy	One (storage)	Three (platform, storage and endorsement)
Root keys	One (SRK RSA-2048)	Multiple keys and algorithms per hierarchy
Authorization	HMAC, PCR, locality, physical presence	Password, HMAC, and policy (which covers HMAC, PCR, locality, and physical presence).
NVRAM	Unstructured data	Unstructured data, counter, bitmap, extend, PIN pass and fail

The TPM 2.0 policy authorization includes the 1.2 HMAC, locality, physical presence, and PCR. It adds authorization based on an asymmetric digital signature, indirection to another authorization secret, counters and time limits, NVRAM values, a particular command or command parameters, and physical presence. It permits the ANDing and ORing of these authorization primitives to construct complex authorization policies.

Reception

The Trusted Computing Group (TCG) has faced resistance to the deployment of this technology in some areas, where some authors see possible uses not specifically related to Trusted Computing, which may raise privacy concerns. The concerns include the abuse of remote validation of software decides what software is allowed to run and possible ways to follow actions taken by the user being recorded in a database, in a manner that is completely undetectable to the user.^[52]

The TrueCrypt disk encryption utility, as well as its derivative VeraCrypt, do not support TPM. The original TrueCrypt developers were of the opinion that the exclusive purpose of the TPM is "to protect against attacks that require the attacker to have administrator privileges, or physical access to the computer". The attacker who has physical or administrative access to a computer can circumvent TPM, e.g., by installing a hardware keystroke logger, by resetting TPM, or by capturing memory contents and retrieving TPM-issued keys. The condemning text goes so far as to claim that TPM is entirely redundant.^[53] The VeraCrypt publisher has reproduced the original allegation with no changes other than replacing "TrueCrypt" with "VeraCrypt".^[54] The author is right that, after achieving either unrestricted physical access or administrative privileges, it is only a matter of time before other security measures in place are bypassed.^{[55] [56]} However, stopping an attacker in possession of administrative privileges has never been one of the goals of TPM (see for details), and TPM can stop some physical tampering.

In 2015 Richard Stallman suggested to replace the term "Trusted computing" with the term "Treacherous computing" due to the danger that the computer can be made to systematically disobey its owner if the cryptographical keys are kept secret from them. He also considers that TPMs available for PCs in 2015 are not currently dangerous and that there is no reason not to include one in a computer or support it in software due to failed attempts from the industry to use that technology for DRM, but that the TPM2 released in 2022 is precisely the "treacherous computing" threat he had warned of.^[57]

Attacks

In 2010 Christopher Tarnovsky presented an attack against TPMs at Black Hat Briefings, where he claimed to be able to extract secrets from a single TPM. He was able to do this after 6 months of work by inserting a probe and spying on an internal bus for the Infineon SLE 66 CL PC.^{[58] [59]}

In 2015 as part of the Snowden revelations, it was revealed that in 2010 a US CIA team claimed at an internal conference to have carried out a differential power analysis attack against TPMs that was able to extract secrets.^{[60] [61]}

In 2018, a design flaw in the TPM 2.0 specification for the static root of trust for measurement (SRTM) was reported . It allows an adversary to reset and forge platform configuration registers which are designed to securely hold measurements of software that are used for bootstrapping a computer.^[62] Fixing it requires hardware-specific firmware patches. An attacker abuses power interrupts and TPM state restores to trick TPM into thinking that it is running on non-tampered components.^[63]

Main Trusted Boot (tboot) distributions before November 2017 are affected by a dynamic root of trust for measurement (DRTM) attack, which affects computers running on Intel's Trusted eXecution Technology (TXT) for the boot-up routine.

In case of physical access, computers with TPM are vulnerable to cold boot attacks as long as the system is on or can be booted without a passphrase from shutdown or hibernation, which is the default setup for Windows computers with BitLocker full disk encryption.^[64]

In 2021, the Dolos Group showed an attack on a discrete TPM, where the TPM chip itself had some tamper resistance, but the other endpoints of its communication bus did not. They read a full-disk-encryption key as it was transmitted across the motherboard, and used it to decrypt the laptop's SSD.^[65]

2017 weak key generation controversy

See main article: ROCA vulnerability. In October 2017, it was reported that a code library developed by Infineon, which had been in widespread use in its TPMs, contained a vulnerability, known as ROCA, which generated weak RSA key pairs that allowed private keys to be inferred from public keys. As a result, all systems depending upon the privacy of such weak keys are vulnerable to compromise, such as identity theft or spoofing.^[66]

Cryptosystems that store encryption keys directly in the TPM without blinding could be at particular risk to these types of attacks, as passwords and other factors would be meaningless if the attacks can extract encryption secrets.^[67]

Infineon has released firmware updates for its TPMs to manufacturers who have used them.^[68]

Availability

Currently, a TPM is provided by nearly all PC and notebook manufacturers in their products.

TPM

The TPM is implemented by several vendors:

• Infineon provides both TPM chips and TPM software, which are delivered as OEM versions with new computers as well as separately by Infineon for products with TPM technology which comply with TCG standards. For example, Infineon licensed TPM management software to Broadcom Corp. in 2004.^[69]
• Microchip (formerly Atmel) manufactured TPM devices that it claims to be compliant to the Trusted Platform Module specification version 1.2 revision 116 and offered with several interfaces (LPC, SPI, and I2C), modes (FIPS 140-2 certified and standard mode), temperature grades (commercial and industrial), and packages (TSSOP and QFN).^{[70] [71] [72]} Its TPMs support PCs and embedded devices.^[70] It also provides TPM development kits to support integration of its TPM devices into various embedded designs.^[73]
• Nuvoton Technology Corporation provides TPM devices for PC applications. Nuvoton also provides TPM devices for embedded systems and Internet of Things (IoT) applications via I2C and SPI host interfaces. Nuvoton's TPM complies with Common Criteria (CC) with assurance level EAL 4 augmented with ALC_FLR.1, AVA_VAN.4 and ALC_DVS.2, FIPS 140-2 level 2 with Physical Security and EMI/EMC level 3 and Trusted Computing Group Compliance requirements, all supported within a single device. TPMs produced by Winbond are now part of Nuvoton.^[74]
• STMicroelectronics has provided TPMs for PC platforms and embedded systems since 2005. The product offering ^[75] includes discrete devices with several interfaces supporting Serial Peripheral Interface (SPI) and I²C and different qualification grades (consumer, industrial and automotive). The TPM products are Common Criteria (CC) certified EAL4+ augmented with ALC_FLR.1 and AVA_VAN.5, FIPS 140-2 level 2 certified with physical security level 3 and also Trusted Computing Group (TCG) certified.

There are also hybrid types; for example, TPM can be integrated into an Ethernet controller, thus eliminating the need for a separate motherboard component.^{[76] [77]}

Field upgrade

Field upgrade is the TCG term for updating the TPM firmware. The update can be between TPM 1.2 and TPM 2.0, or between firmware versions. Some vendors limit the number of transitions between 1.2 and 2.0, and some restrict rollback to previous versions. Platform OEMs such as HP^[78] supply an upgrade tool.

Since July 28, 2016, all new Microsoft device models, lines, or series (or updating the hardware configuration of an existing model, line, or series with a major update, such as CPU, graphic cards) implement, and enable by default TPM 2.0.

While TPM 1.2 parts are discrete silicon components, which are typically soldered on the motherboard, TPM 2.0 is available as a discrete (dTPM) silicon component in a single semiconductor package, an integrated component incorporated in one or more semiconductor packages - alongside other logic units in the same package(s), and as a firmware (fTPM) based component running in a trusted execution environment (TEE) on a general purpose System-on-a-chip (SoC).^[79]

Virtual TPM

• Google Compute Engine offers virtualized TPMs (vTPMs) as part of Google Cloud's Shielded VMs product.^[80]
• The libtpms library provides software emulation of a Trusted Platform Module (TPM 1.2 and TPM 2.0). It targets the integration of TPM functionality into hypervisors, primarily into Qemu.^[81]

Operating systems

• Windows 11 requires TPM 2.0 support as a minimum system requirement.^{[82] [83]} On many systems TPM is disabled by default which requires changing settings in the computer's UEFI to enable it.^[84]
• Windows 8 and later have native support for TPM 2.0.
• Windows 7 can install official patch to add TPM 2.0 support.^[85]
• Windows Vista through Windows 10 have native support for TPM 1.2.
• The Trusted Platform Module 2.0 (TPM 2.0) has been supported by the Linux kernel since version 3.20 (2012)^{[86] [87] [88]}

Platforms

• Google includes TPMs in Chromebooks as part of their security model.^[89]
• Oracle ships TPMs in their X- and T-Series Systems such as T3 or T4 series of servers.^[90] Support is included in Solaris 11.^[91]
• In 2006, with the introduction of first Macintosh models with Intel processors, Apple started to ship Macs with TPM. Apple never provided an official driver, but there was a port under GPL available.^[92] Apple has not shipped a computer with TPM since 2006.^[93]
• In 2011, Taiwanese manufacturer MSI launched its Windpad 110W tablet featuring an AMD CPU and Infineon Security Platform TPM, which ships with controlling software version 3.7. The chip is disabled by default but can be enabled with the included, pre-installed software.^[94]

Virtualization

• VMware ESXi hypervisor has supported TPM since 4.x, and from 5.0 it is enabled by default.^{[95] [96]}
• Xen hypervisor has support of virtualized TPMs. Each guest gets its own unique, emulated, software TPM.^[97]
• KVM, combined with QEMU, has support for virtualized TPMs., it supports passing through the physical TPM chip to a single dedicated guest. QEMU 2.11 released in December 2017 also provides emulated TPMs to guests.^[98]
• VirtualBox has support for virtual TPM 1.2 and 2.0 devices starting with version 7.0 released in October 2022.^[99]

Software

• Microsoft operating systems Windows Vista and later use the chip in conjunction with the included disk encryption component named BitLocker. Microsoft had announced that from January 1, 2015, all computers will have to be equipped with a TPM 2.0 module in order to pass Windows 8.1 hardware certification.^[100] However, in a December 2014 review of the Windows Certification Program this was instead made an optional requirement. However, TPM 2.0 is required for connected standby systems.^[101] Virtual machines running on Hyper-V can have their own virtual TPM module starting with Windows 10 1511 and Windows Server 2016.^[102] Microsoft Windows includes two TPM related commands:, a utility that can be used to retrieve information about the TPM, and, a command-line tool that allows creating and deleting TPM virtual smart cards on a computer.^{[103] [104]}

Endorsement keys

TPM endorsement keys (EKs) are asymmetric key pairs unique to each TPM. They use the RSA and ECC algorithms. The TPM manufacturer usually provisions endorsement key certificates in TPM non-volatile memory. The certificates assert that the TPM is authentic. Starting with TPM 2.0, the certificates are in X.509 DER format.

These manufacturers typically provide their certificate authority root (and sometimes intermediate) certificates on their web sites.

• AMD
• Infineon
• Intel
• NationZ
• Nuvoton
• ST Micro

TPM software libraries

To utilize a TPM, the user needs a software library that communicates with the TPM and provides a friendlier API than the raw TPM communication. Currently, there are several such open-source TPM 2.0 libraries. Some of them also support TPM 1.2, but mostly TPM 1.2 chips are now deprecated and modern development is focused on TPM 2.0.

Typically, a TPM library provides an API with one-to-one mappings to TPM commands. The TCG specification calls this layer the System API(SAPI). This way the user has more control over the TPM operations, however the complexity is high. To hide some of the complexity most libraries also offer simpler ways to invoke complex TPM operations. The TCG specification call these two layers Enhanced System API(ESAPI) and Feature API(FAPI).

There is currently only one stack that follows the TCG specification. All the other available open-source TPM libraries use their own form of richer API.

Summary of the existing open-source TPM libraries!TPM Libraries!API!TPM 2.0!TPM 1.2!Attestation server or example!Microsoft
Windows!Linux!Bare metal

tpm2-tss	SAPI, ESAPI and FAPI from the TCG specification						Maybe
ibmtss^[105] ^[106]	1:1 mapping to TPM commands + rich API (mild layer on top)
go-tpm	1:1 mapping to TPM commands + rich API (mild layer on top)
wolfTPM	1:1 mapping to TPM commands + rich API (wrappers)
TSS.MSR	1:1 mapping to TPM commands + rich API (wrappers)

These TPM libraries are sometimes also called TPM stacks, because they provide the interface for the developer or user to interact with the TPM. As seen from the table, the TPM stacks abstract the operating system and transport layer, so the user could migrate one application between platforms. For example, by using TPM stack API the user would interact the same way with a TPM, regardless if the physical chip is connected over SPI, I2C or LPC interface to the Host system.

See also

• AMD Platform Security Processor
• ARM TrustZone
• Crypto-shredding
• Hardware security
• Hardware security module
• Hengzhi chip
• Intel Management Engine
• Microsoft Pluton
• Next-Generation Secure Computing Base
• Secure Enclave
• Threat model

Notes and References

1. Web site: Warren . Tom . 2021-06-25 . Why Windows 11 is forcing everyone to use TPM chips . 2021-11-13 . The Verge . en.
2. Web site: ISO/IEC 11889-1:2009 – Information technology – Trusted Platform Module – Part 1: Overview . ISO.org . . May 2009 . November 30, 2013 . January 28, 2017 . https://web.archive.org/web/20170128033043/http://www.iso.org/iso/catalogue_detail.htm?csnumber=50970 . live .
3. Web site: TPM 1.2 Main Specification. 2021-11-08. Trusted Computing Group. en-US.
4. Web site: Trusted Platform Module (TPM) Specifications . . March 1, 2011 . October 30, 2016 . October 22, 2017 . https://web.archive.org/web/20171022063836/https://trustedcomputinggroup.org/tpm-main-specification/ . live .
5. Web site: 2014-04-01. Trusted Computing Group Releases TPM 2.0 Specification for Improved Platform and Device Security . 2021-11-08 . Trusted Computing Group . en-US.
6. Web site: TPM Library Specification 2.0 . Trusted Computing Group . October 30, 2016 . 29 October 2016 . https://web.archive.org/web/20161029235918/https://www.trustedcomputinggroup.org/tpm-library-specification/ . live .
7. 1008.2223 . Benchmarking the True Random Number Generator of TPM Chips . Alin Suciu . Tudor Carean. cs.CR. 2010.
8. Web site: Understanding Machine-Level and User-Level RSA Key Containers . October 22, 2014 .
9. Web site: tspi_data_bind(3) – Encrypts data blob. Posix manual page. Trusted Computing Group. October 27, 2009. November 29, 2013. https://web.archive.org/web/20131129101856/http://linux.die.net/man/3/tspi_data_bind . live.
10. Web site: TPM – Trusted Platform Module . . https://web.archive.org/web/20160803203400/http://www-01.ibm.com/support/docview.wss?uid=pos1R1003970&aid=1 . August 3, 2016.
11. Web site: 2021-06-28. Windows 11 TPM 2.0 requirement has a special exception. live. https://web.archive.org/web/20210628033548/https://www.slashgear.com/windows-11-tpm-2-0-requirement-has-a-special-exception-27680130/ . June 28, 2021. 2021-06-29. SlashGear . en-US.
12. Web site: LUKS support for storing keys in TPM NVRAM . 2013 . December 19, 2013 . github.com . September 16, 2013 . https://web.archive.org/web/20130916075234/https://github.com/shpedoikal/tpm-luks . live .
13. Web site: Microsoft Office Outlook Exchange Error 80090016 After a System Board Replacement. December 23, 2020. June 28, 2021. https://web.archive.org/web/20210628200144/https://www.dell.com/support/kbdoc/en-uk/000137758/microsoft-office-outlook-exchange-error-80090016-after-a-system-board-replacement. live.
14. Web site: Intel Trusted Execution Technology. Greene. James. 2012. Intel. white paper. December 18, 2013. June 11, 2014. https://web.archive.org/web/20140611161421/http://www.intel.com/content/dam/www/public/us/en/documents/white-papers/trusted-execution-technology-security-paper.pdf. live.
15. Web site: TPM Encryption . March 29, 2021. June 28, 2021. https://web.archive.org/web/20210628045716/https://www.techsectora.com/2021/02/tpm-header-what-is-it-and-why-is-it-used.html?m=1 . live.
16. Web site: Get Started with Virtual Smart Cards: Walkthrough Guide. December 23, 2020 . March 24, 2021. https://web.archive.org/web/20210324164541/https://docs.microsoft.com/en-us/windows/security/identity-protection/virtual-smart-cards/virtual-smart-card-get-started#step-3-enroll-for-the-certificate-on-the-tpm-virtual-smart-card . live.
17. Book: Autonomic and Trusted Computing: 4th International Conference . ATC . 2007 . 9783540735465 .
18. Book: Trusted computing platforms: TCPA technology in context. Siani. Pearson. Boris. Balacheff . Prentice Hall . 2002 . 9780130092205.
19. Web site: SetPhysicalPresenceRequest Method of the Win32_Tpm Class . . June 12, 2009 . May 19, 2009 . https://web.archive.org/web/20090519204808/http://msdn.microsoft.com/en-us/library/aa376478(VS.85).aspx . live .
20. Book: Instruction 8500.01 . 14 March 2014 . US Department of Defense . 43 .
21. Web site: TPM Certified Products List . Trusted Computing Group . October 1, 2016 . October 14, 2016 . https://web.archive.org/web/20161014153730/http://www.trustedcomputinggroup.org/membership/certification/tpm-certified-products/ . live .
22. Web site: TCG Vendor ID Registry . 23 September 2015 . 27 October 2016 . 28 October 2016 . https://web.archive.org/web/20161028083456/https://www.trustedcomputinggroup.org/wp-content/uploads/Vendor_ID_Registry_0-8_clean.pdf . live .
23. Web site: TPM Recommendations . Lich . Brian . Browers . Nick . 27 October 2017 . Microsoft Docs . . Hall . Justin . McIlhargey . Bill . Farag . Hany . 10 January 2018 . 11 January 2018 . https://web.archive.org/web/20180111052704/https://docs.microsoft.com/en-us/windows/device-security/tpm/tpm-recommendations . live .
24. Web site: Trusted Platform Module 2.0: A Brief Introduction . October 13, 2016 . Trusted Computing Group . March 31, 2018. February 3, 2019 . https://web.archive.org/web/20190203202259/https://www.trustedcomputinggroup.org/wp-content/uploads/TPM-2.0-A-Brief-Introduction.pdf . live.
25. Web site: TPM Certified Products.
26. Web site: Trusted Platform Module (TPM) - 2.0: A BRIEF INTRODUCTION. 2023-08-20 .
27. https://cloud.google.com/security/shielded-cloud/shielded-vm#vtpm GCE Shielded VM - Virtual Trusted Platform Module (vTPM)
28. Web site: GitHub - microsoft/ms-tpm-20-ref: Reference implementation of the TCG Trusted Platform Module 2.0 specification. . GitHub . April 5, 2020 . October 27, 2020 . https://web.archive.org/web/20201027190036/https://github.com/microsoft/ms-tpm-20-ref . live .
29. Web site: Intel Open-Sources New TPM2 Software Stack - Phoronix . April 5, 2020 . August 10, 2020 . https://web.archive.org/web/20200810025300/https://www.phoronix.com/scan.php?page=news_item&px=Intel-New-Open-Source-TPM2 . live .
30. Web site: Linux TPM2 & TSS2 Software . . April 5, 2020 . July 9, 2020 . https://web.archive.org/web/20200709134944/https://github.com/tpm2-software . live .
31. Web site: The TPM2 Software Stack: Introducing a Major Open Source Release Intel Software . April 5, 2020 . April 9, 2020 . https://web.archive.org/web/20200409075120/https://software.intel.com/en-us/blogs/2018/08/29/tpm2-software-stack-open-source . live .
32. Web site: Open source TPM 2.0 software stack eases security adoption . August 17, 2018 . April 5, 2020 . June 18, 2019 . https://web.archive.org/web/20190618182510/https://www.eenewsembedded.com/news/open-source-tpm-20-software-stack-eases-security-adoption . live .
33. Web site: Infineon Enables Open Source Software Stack for TPM 2.0 . August 17, 2018 . April 5, 2020 . February 3, 2021 . https://web.archive.org/web/20210203092444/https://www.bisinfotech.com/infineon-enables-open-source-software-stack-for-tpm-2-0/ . live .
34. Web site: IBM's Software TPM 2.0 download SourceForge.net . April 5, 2020 . June 12, 2019 . https://web.archive.org/web/20190612221519/https://sourceforge.net/projects/ibmswtpm2/ . live .
35. Web site: IBM SW TPM 2.0 . . June 2, 2021 . September 18, 2020 . https://web.archive.org/web/20200918030405/https://github.com/kgoldman/ibmswtpm2 . live .
36. Web site: 2022-03-08 . Intermittent System Stutter Experienced with fTPM Enabled on Windows 10 and 11 . 2022-07-02 . AMD.
37. Web site: Paul Alcorn . 2022-03-07 . AMD Issues Fix and Workaround for Ryzen's fTPM Stuttering Issues . 2022-07-02 . Tom's Hardware . en.
38. Web site: TPM 1.2 vs. 2.0 Features | Dell US.
39. Web site: TPM 1.2, 2.0 and FTPM (Firmware-based TPM) Information . August 31, 2020 . February 6, 2020 . https://web.archive.org/web/20200206234241/http://aps2.toshiba-tro.de/kb0/TSB8B03XO0000R01.htm . live .
40. Book: Will . Arthur . David . Challener . Kenneth . Goldman . A Practical Guide to TPM 2.0: Using the New Trusted Platform Module in the New Age of Security . Apress Media, LLC . 2015 . . 978-1430265832 . 69. 10.1007/978-1-4302-6584-9 . 27168869 .
41. Web site: PC Client Protection Profile for TPM 2.0 – Trusted Computing Group. trustedcomputinggroup.org. October 30, 2016. October 31, 2016. https://web.archive.org/web/20161031085440/https://www.trustedcomputinggroup.org/pc-client-protection-profile-tpm-2-0/. live.
42. Web site: TPM 2.0 Mobile Reference Architecture Specification – Trusted Computing Group . trustedcomputinggroup.org . October 31, 2016. November 1, 2016. https://web.archive.org/web/20161101103322/https://www.trustedcomputinggroup.org/tpm-2-0-mobile-reference-architecture-specification/. live.
43. Web site: TCG TPM 2.0 Library Profile for Automotive-Thin . trustedcomputinggroup.org . 1 March 2015 . April 25, 2017 . April 26, 2017 . https://web.archive.org/web/20170426062330/https://trustedcomputinggroup.org/tcg-tpm-2-0-library-profile-automotive-thin/ . live .
44. Web site: Archived copy . October 29, 2016 . October 30, 2016 . https://web.archive.org/web/20161030140755/http://trustedcomputinggroup.org/wp-content/uploads/TPM-Main-Part-2-TPM-Structures_v1.2_rev116_01032011.pdf . live .
45. Web site: Archived copy . October 29, 2016 . October 30, 2016 . https://web.archive.org/web/20161030080258/http://trustedcomputinggroup.org/wp-content/uploads/mainP2Struct_rev85.pdf . live .
46. Web site: TPM Main Specification Level 2 Version 1.2, Revision 103: Part 1 Design Principles . February 16, 2024 . July 9, 2007.
47. Web site: TCG Protection Profile for PC Client Specific TPM 2.0 Library Revision 1.59; Version 1.3 . February 16, 2024 . September 29, 2021.
48. Web site: Archived copy . October 30, 2016 . October 31, 2016 . https://web.archive.org/web/20161031085411/https://www.trustedcomputinggroup.org/wp-content/uploads/TCG_Algorithm_Registry_Rev_1.22.pdf . live .
49. Web site: Archived copy . January 23, 2019 . January 23, 2019 . https://web.archive.org/web/20190123223556/https://trustedcomputinggroup.org/wp-content/uploads/TCG-_Algorithm_Registry_Rev_1.27_FinalPublication.pdf . live .
50. Web site: Archived copy . October 30, 2016 . October 31, 2016 . https://web.archive.org/web/20161031085415/http://trustedcomputinggroup.org/wp-content/uploads/TPM-Main-Part-1-Design-Principles_v1.2_rev116_01032011.pdf . live .
51. Web site: Archived copy . October 27, 2016 . October 28, 2016 . https://web.archive.org/web/20161028083957/https://www.trustedcomputinggroup.org/wp-content/uploads/TPM-Rev-2.0-Part-1-Architecture-01.16.pdf . live .
52. Web site: Richard Matthew . Stallman . Project GNU . Free Software Foundation . 21 July 2016 . 29 June 2011 . https://web.archive.org/web/20110629082333/http://www.gnu.org/philosophy/can-you-trust.html . live .
53. Web site: TrueCrypt User Guide . truecrypt.org . TrueCrypt Foundation . grc.com . 7 February 2012 . 129 .
54. Web site: FAQ . veracrypt.fr . IDRIX . 2 July 2017 .
55. Web site: Culp . Scott . 2000 . Ten Immutable Laws Of Security (Version 2.0) . dead . https://web.archive.org/web/20151209191417/https://technet.microsoft.com/en-us/library/hh278941.aspx . 9 December 2015 . . . Microsoft TechNet.
56. Web site: Johansson . Jesper M. . October 2008 . Security Watch Revisiting the 10 Immutable Laws of Security, Part 1 . dead . https://web.archive.org/web/20170410043155/https://technet.microsoft.com/en-us/library/2008.10.securitywatch.aspx . 10 April 2017 . . . Microsoft TechNet.
57. Web site: Can You Trust Your Computer? - GNU Project - Free Software Foundation. 2023-09-06. www.gnu.org.
58. Web site: Black Hat: Researcher claims hack of processor used to secure Xbox 360, other products. January 30, 2012. August 10, 2017. bot: unknown. https://web.archive.org/web/20120130095246/https://www.networkworld.com/news/2010/020210-black-hat-processor-security.html. January 30, 2012.
59. Web site: TPM crytography cracked. Szczys. Mike. February 9, 2010. HACKADAY. https://web.archive.org/web/20100212050338/https://hackaday.com/2010/02/09/tpm-crytography-cracked/. February 12, 2010.
60. Web site: The CIA Campaign to Steal Apple's Secrets . Scahill. Jeremy ScahillJosh BegleyJeremy . Begley . Josh. The Intercept. August 10, 2017. March 10, 2015. August 9, 2017. https://web.archive.org/web/20170809064512/https://theintercept.com/2015/03/10/ispy-cia-campaign-steal-apples-secrets/. live.
61. News: TPM Vulnerabilities to Power Analysis and An Exposed Exploit to Bitlocker – The Intercept . The Intercept. August 10, 2017. en-US. July 9, 2017 . https://web.archive.org/web/20170709222530/https://theintercept.com/document/2015/03/10/tpm-vulnerabilities-power-analysis-exposed-exploit-bitlocker/. live.
62. A Bad Dream: Subverting Trusted Platform Module While You Are Sleeping. Seunghun. Han. Wook. Shin . Jun-Hyeok . Park . HyoungChun . Kim. August 15–17, 2018 . USENIX Association . Baltimore, MD, USA. 27th USENIX Security Symposium . 9781939133045 . https://web.archive.org/web/20180820032203/https://www.usenix.org/system/files/conference/usenixsecurity18/sec18-han.pdf . 20 August 2018 . live.
63. Web site: Researchers Detail Two New Attacks on TPM Chips . Catalin . Cimpanu. Bleeping Computer . August 29, 2018. 28 September 2019 . https://web.archive.org/web/20181007062452/https://www.bleepingcomputer.com/news/security/researchers-detail-two-new-attacks-on-tpm-chips/. 7 October 2018. live.
64. Episode 14 Reinventing the Cold Boot Attack: Modern Laptop Version . Melissa Michael . F-Secure Blog . 8 October 2018 . 28 September 2019. https://web.archive.org/web/20190928091354/https://blog.f-secure.com/podcast-reinventing-cold-boot-attack/. 28 September 2019. live.
65. Web site: Trusted platform module security defeated in 30 minutes, no soldering required . August 3, 2021.
66. Web site: Goodin . Dan . Millions of high-security crypto keys crippled by newly discovered flaw . Ars Technica . October 16, 2017 . October 18, 2017 . October 19, 2018 . https://web.archive.org/web/20181019012939/https://arstechnica.com/information-technology/2017/10/crypto-failure-cripples-millions-of-high-security-keys-750k-estonian-ids/ . live .
67. Web site: Can the NSA Break Microsoft's BitLocker? – Schneier on Security. www.schneier.com. August 10, 2017. August 10, 2017. https://web.archive.org/web/20170810210547/https://www.schneier.com/blog/archives/2015/03/can_the_nsa_bre_1.html. live.
68. Web site: "TPM Update - Infineon Technologies" . March 19, 2021 . February 5, 2021 . https://web.archive.org/web/20210205072055/https://www.infineon.com/cms/en/product/promopages/tpm-update/ . live .
69. Web site: Trusted Platform Module (TPM) im LAN-Adapter. March 12, 2005 . Heise Online. January 7, 2019. January 7, 2019. https://web.archive.org/web/20190107232935/https://www.heise.de/newsticker/meldung/Trusted-Platform-Module-TPM-im-LAN-Adapter-143777.html. live.
70. Web site: Home – Microchip Technology. www.atmel.com. October 4, 2016. October 5, 2016. https://web.archive.org/web/20161005162507/http://www.atmel.com/products/security-ics/embedded/. dead.
71. Web site: AN_8965 TPM Part Number Selection Guide – Application Notes – Microchip Technology Inc.. www.atmel.com. October 4, 2016. October 5, 2016. https://web.archive.org/web/20161005171009/http://www.atmel.com/Images/Atmel-8965-TPM-Part-No-Selection-Guide-ApplicationNote.pdf. dead.
72. Web site: "Trusted Platform Module" . . Microchip Technology . 2024-02-14 .
73. Web site: Home – Microchip Technology. www.atmel.com. October 4, 2016. October 5, 2016. https://web.archive.org/web/20161005165740/http://www.atmel.com/products/security-ics/embedded/?tab=tools. dead.
74. Web site: Nuvoton TPM.
75. Web site: STSAFE-TPM.
76. Web site: Replacing Vulnerable Software with Secure Hardware: The Trusted Platform Module (TPM) and How to Use It in the Enterprise . 2008 . June 7, 2014 . Trusted computing group . July 14, 2014 . https://web.archive.org/web/20140714233816/https://www.trustedcomputinggroup.org/files/temp/4B551C9F-1D09-3519-AD45C1F0B5D61714/TPM%20Overview.pdf . live .
77. Web site: NetXtreme Gigabit Ethernet Controller with Integrated TPM1.2 for Desktops . May 6, 2009 . June 7, 2014 . Broadcom . June 14, 2014 . https://web.archive.org/web/20140614134124/http://www.broadcom.com/products/Ethernet-Controllers-and-Adapters/Enterprise-Client-Controllers/BCM5752 . live .
78. Web site: HP TPM Configuration Utility.
79. Web site: TPM vs PTT: What are the main differences between these technologies? . August 9, 2021 .
80. Web site: Shielded VMs. Google Cloud. April 12, 2019. April 12, 2019. https://web.archive.org/web/20190412112007/https://cloud.google.com/shielded-vm/. live.
81. Web site: libtpms Virtual TPM. GitHub. October 27, 2021.
82. Web site: Microsoft. Windows 11 Specs and System Requirements Microsoft. 2021-10-02. Windows. en-us.
83. Chabaud . Florent . Setting Hardware Root-of-Trust from Edge to Cloud, and How to Use it . Proceedings of the 29th Computer & Electronics Security Application Rendezvous . 115–130 . C&ESAR 2022 . Rennes, France . November 15–16, 2022 . le Guernic . Gurvan . Location: Université de Rennes 1, Campus de Beaulieu, IRISA/Inria Rennes, 263 avenue du Général Leclerc, 35042 RENNES cedex.
84. Web site: 2021-06-24. Windows 11 update: TPM 2.0 and PC Health Check confusion. live. https://web.archive.org/web/20210624203318/https://www.slashgear.com/windows-11-tpm-2-0-update-system-requirement-confusion-24679866/. June 24, 2021. 2021-06-24. SlashGear. en-US.
85. Web site: Update to add support for TPM 2.0 in Windows 7 and Windows Server 2008 R2 - Microsoft Support .
86. Web site: TPM 2.0 Support Sent In For The Linux 3.20 Kernel - Phoronix . April 5, 2020 . February 28, 2021 . https://web.archive.org/web/20210228102638/https://www.phoronix.com/scan.php?page=news_item&px=Linux-3.20-TPM-2.0-Security . live .
87. Web site: TPM 2.0 Support Continues Maturing In Linux 4.4 - Phoronix . April 5, 2020 . March 5, 2021 . https://web.archive.org/web/20210305070203/https://www.phoronix.com/scan.php?page=news_item&px=TPM-2.0-Security-Linux-4.4 . live .
88. Web site: With Linux 4.4, TPM 2.0 Gets Into Shape For Distributions - Phoronix . April 5, 2020 . August 14, 2020 . https://web.archive.org/web/20200814003044/https://www.phoronix.com/scan.php?page=news_item&px=Linux-4.4-TPM-2.0 . live .
89. Web site: Chromebook security: browsing more securely . Chrome Blog . April 7, 2013 . April 25, 2016 . https://web.archive.org/web/20160425070152/https://chrome.googleblog.com/2011/07/chromebook-security-browsing-more.html . live .
90. Web site: Oracle Solaris and Oracle SPARC T4 Servers— Engineered Together for Enterprise Cloud Deployments . Oracle . October 12, 2012 . October 24, 2012 . https://web.archive.org/web/20121024150758/http://www.oracle.com/us/products/servers-storage/solaris/solaris-and-sparc-t4-497273.pdf . live .
91. Web site: tpmadm . manpage . Oracle . October 12, 2012 . November 14, 2012 . https://web.archive.org/web/20121114112129/http://docs.oracle.com/cd/E23824_01/html/821-1462/tpmadm-1m.html . live .
92. .
93. Web site: Your Laptop Data Is Not Safe. So Fix It . January 20, 2009 . PC World . August 22, 2013 . November 4, 2013 . https://web.archive.org/web/20131104211218/http://www.pcworld.com/article/157966/laptop_security.html . live .
94. Web site: TPM. Complete protection for peace of mind. Winpad 110W. MSI. May 20, 2013. May 13, 2013. https://web.archive.org/web/20130513043710/http://www.msi.com/product/windpad/WindPad-110W.html. live.
95. .
96. .
97. Web site: XEN Virtual Trusted Platform Module (vTPM) . September 28, 2015 . September 15, 2015 . https://web.archive.org/web/20150915104249/http://wiki.xenproject.org/wiki/Virtual_Trusted_Platform_Module_(vTPM) . live .
98. Web site: QEMU 2.11 Changelog . December 12, 2017 . February 8, 2018 . qemu.org . February 9, 2018 . https://web.archive.org/web/20180209003144/https://wiki.qemu.org/ChangeLog/2.11#TPM . live .
99. Web site: Changelog for VirtualBox 7.0 . live . https://web.archive.org/web/20221106172436/https://www.virtualbox.org/wiki/Changelog-7.0 . November 6, 2022 . October 10, 2022 . November 6, 2022 . virtualbox.org.
100. Web site: Windows Hardware Certification Requirements. Microsoft. July 23, 2013. June 29, 2021. https://web.archive.org/web/20210629081025/https://docs.microsoft.com/en-us/previous-versions/windows/hardware/cert-program/?redirectedfrom=MSDN. live.
101. Web site: Windows Hardware Certification Requirements for Client and Server Systems . Microsoft . June 5, 2015 . July 1, 2015 . https://web.archive.org/web/20150701150150/https://msdn.microsoft.com/en-US/library/windows/hardware/jj128256 . live .
102. Web site: What's new in Hyper-V on Windows Server 2016. Microsoft. March 24, 2017. March 25, 2017. https://web.archive.org/web/20170325113136/https://technet.microsoft.com/en-us/windows-server-docs/compute/hyper-v/what-s-new-in-hyper-v-on-windows. live.
103. https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/tpmtool tpmtool | Microsoft Docs
104. https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/tpmvscmgr tpmvscmgr | Microsoft Docs
105. Web site: IBM TSS for TPM 2.0. June 2, 2021. June 29, 2021. https://web.archive.org/web/20210629081044/https://sourceforge.net/projects/ibmtpm20tss/. live.
106. Web site: IBM TSS for TPM 2.0. GitHub. June 2, 2021. June 29, 2021. https://web.archive.org/web/20210629081026/https://github.com/kgoldman/ibmtss. live.