Trusted Platform Module

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Trusted Platform Module
StatusPublished
Year started2009; 12 years ago (2009)
Latest versionISO/IEC 11889:2015
2015; 6 years ago (2015)
OrganizationTrusted Computing Group, ISO/IEC JTC 1
DomainSecure cryptoprocessor
AbbreviationTPM
WebsiteISO/IEC 11889-1:2015, ISO/IEC 11889-2:2015, ISO/IEC 11889-3:2015, ISO/IEC 11889-4:2015
Components of a Trusted Platform Module complying with the TPM version 1.2 standard

Trusted Platform Module (TPM, also known as ISO/IEC 11889) is an international standard for a secure cryptoprocessor, a dedicated microcontroller designed to secure hardware through integrated cryptographic keys.

History[]

Trusted Platform Module (TPM) was conceived by a computer industry consortium called Trusted Computing Group (TCG), and was standardized by International Organization for Standardization (ISO) and International Electrotechnical Commission (IEC) in 2009 as ISO/IEC 11889.[1]

When a new revision is released it is broken down into 3 parts by the Trusted Computing Group. Each part consists of a PDF that makes up the bible of the new TPM specification.

  • Part 1 – Design Principles
  • Part 2 – Structures of the TPM
  • Part 3 – Commands

TCG continues to revise the TPM specifications keeping it up with current needs. TPM Main Specification Version 1.2 was finalized on March 3, 2011 completing its revision.[2] TCG has moved over to TPM Library Specification 2.0 with its latest edition published in 2019.[3]

Overview[]

Trusted Platform Module provides

  • A hardware random number generator[4][5]
  • 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. The software in charge of hashing the configuration data determines the extent of the summary. This allows a third party to verify that the software has not been changed.
  • Binding: Encrypts data using the TPM bind key, a unique RSA key descended from a storage key[clarification needed].[6]
  • Sealing: Similar to binding, but in addition, specifies the TPM state[7] for the data to be decrypted (unsealed).[8]
  • Other Trusted Computing functions for the data to be decrypted (unsealed).[9]

Computer programs can use a TPM to authenticate hardware devices, since each TPM chip has a unique and secret Endorsement Key (EK) burned in as it is produced. Pushing the security down to the hardware level provides more protection than a software-only solution.[10]

Uses[]

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 DISA STIGs and where such technology is available." DoD anticipates that TPM is to be used for device identification, authentication, encryption, and device integrity verification.[11]

Platform integrity[]

The primary scope of TPM is to ensure the integrity of a platform. In this context, "integrity" means "behave 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, 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. Good examples 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]

An 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 and BitLocker, 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 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-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]

TPM implementations[]

Trusted Platform Module installed on a motherboard
TPM 2.0 Reference Implementation
Developer(s)Microsoft
Repositorygithub.com/Microsoft/ms-tpm-20-ref
Written inC, C++
TypeTPM implementation
LicenseBSD License
Websitetrustedcomputinggroup.org/tpm-library-specification

Starting in 2006, many new laptops have been 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 LPC bus or the 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,[20] 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.[21]

There are five different types of TPM 2.0 implementations (listed in order from most to least secure):[22][23]

  • Discrete TPMs are dedicated chips that implement TPM functionality in their own tamper resistant semiconductor package. They are theoretically the most secure type of TPM because the routines implemented in hardware should be[vague] more resistant to bugs[clarification needed] versus routines implemented in software, and their packages are required to implement some tamper resistance.
  • 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.
  • Hypervisor TPMs (vTPMs) are virtual TPMs provided by and rely on hypervisors, in an isolated execution environment that is 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.
  • 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, and they are vulnerable to their own software bugs and attacks that are penetrating the normal execution environment.[citation needed] They are useful for development purposes.

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.[24] Microsoft provides a Visual Studio solution and Linux autotools build scripts.

In 2018, Intel open-sourced its Trusted Platform Module 2.0 (TPM2) software stack with support for Linux and Microsoft Windows.[25] The source code is hosted on GitHub and licensed under BSD License.[26][27]

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.[28] It was developed by Fraunhofer Institute for Secure Information Technology (SIT).[29]

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[30] and GitHub[31] and licensed under BSD License.

TPM 1.2 vs 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.[32][33][34]

Specification TPM 1.2 TPM 2.0
Architecture The one-size-fits-all specification consists of three parts.[2] A complete specification consists of a platform-specific specification which references a common four-part TPM 2.0 library.[35][3] Platform-specific specifications define what parts of the library are mandatory, optional, or banned for that platform; and detail other requirements for that platform.[35] Platform-specific specifications include PC Client,[36] mobile,[37] and Automotive-Thin.[38]
Algorithms SHA-1 and RSA are required.[39] AES is optional.[39] Triple DES was once an optional algorithm in earlier versions of TPM 1.2,[40] but has been banned in TPM 1.2 version 94.[41] The MGF1 hash-based mask generation function that is defined in PKCS#1 is required.[39] The PC Client Platform TPM Profile (PTP) Specification requires SHA-1 and SHA-256 for hashes; RSA, ECC using the Barreto-Naehrig 256-bit curve and 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.[42] Many other algorithms are also defined but are optional.[43] Note that Triple DES was readded into TPM 2.0, but with restrictions some values in any 64-bit block.[44]
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.[39] Symmetric-key algorithms and exclusive or are optional.[39] Key generation is also required.[45] A random number generator, public-key cryptographic algorithms, cryptographic hash functions, symmetric-key algorithms, digital signature generation and verification, mask generation functions, exclusive or, and ECC-based Direct Anonymous Attestation using the Barreto-Naehrig 256-bit curve are required by the TCG PC Client Platform TPM Profile (PTP) Specification.[42] The TPM 2.0 common library specification also requires key generation and key derivation functions.[46]
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.[47]

Reception[]

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 (where the manufacturer‍—‌and not the user who owns the computer system‍—‌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.[48]

The TrueCrypt disk encryption utility does 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. As such, the condemning text goes so far as to claim that TPM is entirely redundant.[49]

According to Richard Stallman in 2015, "there are reasons to think that it will not be feasible to use [TPM] for DRM".[50]

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.[51][52]

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.[53][54]

In 2018, a design flaw in the TPM 2.0 specification for the static root of trust for measurement (SRTM) was reported (CVE-2018-6622). 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.[55] Fixing it requires hardware-specific firmware patches.[55] An attacker abuses power interrupts and TPM state restores to trick TPM into thinking that it is running on non-tampered components.[56]

Main Trusted Boot (tboot) distributions before November 2017 are affected by a dynamic root of trust for measurement (DRTM) attack CVE-2017-16837, which affects computers running on Intel's Trusted eXecution Technology (TXT) for the boot-up routine.[56]

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.[57]

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.[58]

2017 weak key generation controversy[]

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.[59]

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.[60]

Infineon has released firmware updates for its TPMs to manufacturers who have used them.[61]

Availability[]

Currently, a TPM is used by nearly all PC and notebook manufacturers.

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.[62]
  • Microchip (formerly Atmel) manufactures 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).[63][64] Their TPMs support PCs and embedded devices.[63] They also provides TPM development kits to support integration of its TPM devices into various embedded designs.[65]
  • 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.[66]
  • STMicroelectronics has provided TPMs for PC platforms and embedded systems since 2005. The product offering [67] 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.[68][69]

Virtual TPM[]

  • Google Compute Engine offers virtualized TPMs (vTPMs) as part of Google Cloud's Shielded VMs product.[70]
  • 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.[71]

Operating Systems[]

The Trusted Platform Module 2.0 (TPM 2.0) has been supported by the Linux kernel since version 3.20.[72][73][74]

Platforms[]

  • Google includes TPMs in Chromebooks as part of their security model.[75]
  • Oracle ships TPMs in their X- and T-Series Systems such as T3 or T4 series of servers.[76] Support is included in Solaris 11.[77]
  • 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.[78] Apple has not shipped a computer with TPM since 2006.[79]
  • 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.[80]

Virtualization[]

  • VMware ESXi hypervisor has supported TPM since 4.x, and from 5.0 it is enabled by default.[81][82]
  • Xen hypervisor has support of virtualized TPMs. Each guest gets its own unique, emulated, software TPM.[83]
  • KVM, combined with QEMU, has support for virtualized TPMs. As of 2012, it supports passing through the physical TPM chip to a single dedicated guest. QEMU 2.11 released on December 2017 also provides emulated TPMs to guests.[84]

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.[85] 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.[86] Virtual machines running on Hyper-V can have their own virtual TPM module starting with Windows 10 1511 and Windows Server 2016.[87] Windows 11 has TPM 2.0 listed as a minimum system requirement; the operating system cannot be installed unless the module is present and enabled. This has led to confusion as many motherboards do not have TPM support at all, require a compatible TPM module to be physically installed onto the motherboard, or have a built-in TPM on the CPU firmware or hardware level that is disabled by default which requires changing settings in the computer's UEFI to enable.[88] Microsoft Windows includes two TPM related commands: tpmtool, a utility that can be used to retrieve information about the TPM, and tpmvscmgr, a command-line tool that allows creating and deleting TPM virtual smart cards on a computer.[89][90]

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 format.

These manufacturers typically provides their Certificate Authority root (and sometimes intermediate) certificates on their web sites.

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 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. Therefore, most libraries also offer rich API to invoke complex TPM operations and hide some of the complexity. 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[117] SAPI, ESAPI and FAPI
from the TCG specification 		Yes No No, but there is a separate project* Yes Yes Maybe**
ibmtss[118][119] 1:1 mapping to TPM commands
+ rich API (mild layer on top) 		Yes Partial Yes, "IBM ACS"[120][121] Yes Yes No
go-tpm[122] 1:1 mapping to TPM commands
+ rich API (mild layer on top) 		Yes Partial Yes, "Go-attestation"[123] Yes Yes No
wolfTPM[124] 1:1 mapping to TPM commands
+ rich API (wrappers) 		Yes No Yes, examples are inside the library Yes Yes Yes
TSS.MSR[125] 1:1 mapping to TPM commands
+ rich API (wrappers) 		Yes No Yes, examples are inside the library Yes Yes*** No

(*) There is a separate project called "CHARRA" by Fraunhofer[126] that uses the tpm2-tss library for Remote Attestation. The other stacks have accompanying attestation servers or directly include examples for attestation. IBM offer their open-source Remote Attestation Server called "IBM ACS" on Sourceforge and Google have "Go-Attestation" available on GitHub, while "wolfTPM" offers time and local attestation examples directly in its open-source code, also on GitHub.

(**) There is an application note[127] about an example project for the AURIX 32-bit SoC using the tpm2-tss library.

(***) Requires additional libraries (dotnet) to run on Linux.

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.

Developer communities[]

The increasing relevance of computer security and especially hardware-backed security has made the potential use of TPM popular among developers and users. There are several developer communities around using a TPM.

TPM.dev[]

This community[128] has a forum-like platform for sharing information and asking questions. In the platform, one finds articles and video tutorials from community members and guests. There is a regular weekly online call. The main focus of this community is lowering the barrier to adoption of TPM and existing TPM Software Libraries. Specific focus is put on Remote Attestation and trusted applications.

tpm2-software[]

This community[129] is centered around the use of TPM with the tpm2-tss library. The community engages in developing it and other TPM 2.0 related software that can be found at their GitHub account.[130] There also is a tutorials and external section with links to conference talks and presentations.

IBM TSS[]

Nominally addressing the IBM TSS[131][132] most discussions relate to more general application development.

IBM Software TPM[]

Nominally addressing the IBM implementation of a software TPM 2.0,[133][134] most discussions relate to more general application development.

Keylime Project[]

Open Source project that Uses TPM 2.0 for boot and runtime attestation of computers and devices.[135][136]

Linux Security Mailing List[]

linux-integrity@vger.kernel.org is a high volume mailing list. It is more appropriate for TPM device driver issues than general HOWTO questions.

Restriction law[]

Chinese (in the past)[citation needed] and Russian regulations restrict TPM modules access.[137]

See also[]

References[]

  1. ^ "ISO/IEC 11889-1:2009 – Information technology – Trusted Platform Module – Part 1: Overview". ISO.org. International Organization for Standardization. May 2009. Archived from the original on January 28, 2017. Retrieved November 30, 2013.
  2. ^ Jump up to: a b "Trusted Platform Module (TPM) Specifications". Trusted Computing Group. March 1, 2011. Archived from the original on October 22, 2017. Retrieved October 30, 2016.
  3. ^ Jump up to: a b "TPM Library Specification 2.0". Trusted Computing Group. Archived from the original on October 29, 2016. Retrieved October 30, 2016.
  4. ^ Alin Suciu, Tudor Carean (2010). "Benchmarking the True Random Number Generator of TPM Chips". arXiv:1008.2223 [cs.CR].
  5. ^ TPM Main Specification Level 2 (PDF), Part 1 – Design Principles (Version 1.2, Revision 116 ed.), archived (PDF) from the original on February 24, 2021, retrieved September 12, 2017, Our definition of the RNG allows implementation of a Pseudo Random Number Generator (PRNG) algorithm. However, on devices where a hardware source of entropy is available, a PRNG need not be implemented. This specification refers to both RNG and PRNG implementations as the RNG mechanism. There is no need to distinguish between the two at the TCG specification level.
  6. ^ "tspi_data_bind(3) – Encrypts data blob" (Posix manual page). Trusted Computing Group. Archived from the original on November 29, 2013. Retrieved October 27, 2009.
  7. ^ Trusted Platform Module Library Specification, Family "2.0" (PDF), Part 1 – Architecture, Section 12, TPM Operational States (Level 00, Revision 01.59 ed.), Trusted Computing Group, archived (PDF) from the original on January 9, 2021, retrieved January 17, 2021
  8. ^ TPM Main Specification Level 2 (PDF), Part 3 – Commands (Version 1.2, Revision 116 ed.), Trusted Computing Group, archived (PDF) from the original on September 28, 2011, retrieved June 22, 2011
  9. ^ Microsoft Article on TPM, archived from the original on January 2, 2021, retrieved April 1, 2021
  10. ^ "TPM – Trusted Platform Module". IBM. Archived from the original on August 3, 2016.
  11. ^ Instruction 8500.01 (PDF). US Department of Defense. March 14, 2014. p. 43. Archived (PDF) from the original on June 17, 2015. Retrieved July 21, 2016.
  12. ^ "LUKS support for storing keys in TPM NVRAM". github.com. 2013. Archived from the original on September 16, 2013. Retrieved December 19, 2013.
  13. ^ "Microsoft Office Outlook Exchange Error 80090016 After a System Board Replacement". Archived from the original on June 28, 2021. Retrieved December 23, 2020.
  14. ^ Greene, James (2012). "Intel Trusted Execution Technology" (PDF) (white paper). Intel. Archived (PDF) from the original on June 11, 2014. Retrieved December 18, 2013.
  15. ^ "TPM Encryption". Archived from the original on June 28, 2021. Retrieved March 29, 2021.
  16. ^ "Get Started with Virtual Smart Cards: Walkthrough Guide". Archived from the original on March 24, 2021. Retrieved December 23, 2020.
  17. ^ Autonomic and Trusted Computing: 4th International Conference (Google Books). ATC. 2007. ISBN 9783540735465. Archived from the original on August 19, 2020. Retrieved May 31, 2014.
  18. ^ Pearson, Siani; Balacheff, Boris (2002). Trusted computing platforms: TCPA technology in context. Prentice Hall. ISBN 978-0-13-009220-5. Archived from the original on March 25, 2017. Retrieved July 21, 2016.
  19. ^ "SetPhysicalPresenceRequest Method of the Win32_Tpm Class". Microsoft. Archived from the original on May 19, 2009. Retrieved June 12, 2009.
  20. ^ "TPM Certified Products List". Trusted Computing Group. Archived from the original on October 14, 2016. Retrieved October 1, 2016.
  21. ^ "TCG Vendor ID Registry" (PDF). September 23, 2015. Archived (PDF) from the original on October 28, 2016. Retrieved October 27, 2016.
  22. ^ Lich, Brian; Browers, Nick; Hall, Justin; McIlhargey, Bill; Farag, Hany (October 27, 2017). "TPM Recommendations". Microsoft Docs. Microsoft. Archived from the original on January 11, 2018. Retrieved January 10, 2018.
  23. ^ "Trusted Platform Module 2.0: A Brief Introduction" (PDF). Trusted Computing Group. October 13, 2016. Archived (PDF) from the original on February 3, 2019. Retrieved March 31, 2018.
  24. ^ "GitHub - microsoft/ms-tpm-20-ref: Reference implementation of the TCG Trusted Platform Module 2.0 specification". Archived from the original on October 27, 2020. Retrieved April 5, 2020.
  25. ^ "Intel Open-Sources New TPM2 Software Stack - Phoronix". Archived from the original on August 10, 2020. Retrieved April 5, 2020.
  26. ^ "Archived copy". Archived from the original on July 9, 2020. Retrieved April 5, 2020.CS1 maint: archived copy as title (link)
  27. ^ "The TPM2 Software Stack: Introducing a Major Open Source Release | Intel® Software". Archived from the original on April 9, 2020. Retrieved April 5, 2020.
  28. ^ "Open source TPM 2.0 software stack eases security adoption". Archived from the original on June 18, 2019. Retrieved April 5, 2020.
  29. ^ "Infineon Enables Open Source Software Stack for TPM 2.0". Archived from the original on February 3, 2021. Retrieved April 5, 2020.
  30. ^ "IBM's Software TPM 2.0 download | SourceForge.net". Archived from the original on June 12, 2019. Retrieved April 5, 2020.
  31. ^ "IBM SW TPM 2.0". Archived from the original on September 18, 2020. Retrieved June 2, 2021.
  32. ^ "Part 1: Architecture" (PDF), Trusted Platform Module Library, Trusted Computing Group, October 30, 2014, archived (PDF) from the original on October 28, 2016, retrieved October 27, 2016
  33. ^ https://www.dell.com/support/article/en-us/sln312590/tpm-1-2-vs-2-0-features?lang=en
  34. ^ "Archived copy". Archived from the original on February 6, 2020. Retrieved August 31, 2020.CS1 maint: archived copy as title (link)
  35. ^ Jump up to: a b Arthur, Will; Challener, David; Goldman, Kenneth (2015). A Practical Guide to TPM 2.0: Using the New Trusted Platform Module in the New Age of Security. New York City: Apress Media, LLC. p. 69. doi:10.1007/978-1-4302-6584-9. ISBN 978-1430265832. S2CID 27168869.
  36. ^ "PC Client Protection Profile for TPM 2.0 – Trusted Computing Group". trustedcomputinggroup.org. Archived from the original on October 31, 2016. Retrieved October 30, 2016.
  37. ^ "TPM 2.0 Mobile Reference Architecture Specification – Trusted Computing Group". trustedcomputinggroup.org. Archived from the original on November 1, 2016. Retrieved October 31, 2016.
  38. ^ "TCG TPM 2.0 Library Profile for Automotive-Thin". trustedcomputinggroup.org. March 1, 2015. Archived from the original on April 26, 2017. Retrieved April 25, 2017.
  39. ^ Jump up to: a b c d e "Archived copy" (PDF). Archived (PDF) from the original on October 30, 2016. Retrieved October 29, 2016.CS1 maint: archived copy as title (link)
  40. ^ "Archived copy" (PDF). Archived (PDF) from the original on October 30, 2016. Retrieved October 29, 2016.CS1 maint: archived copy as title (link)
  41. ^ "Archived copy" (PDF). Archived (PDF) from the original on October 30, 2016. Retrieved October 29, 2016.CS1 maint: archived copy as title (link)
  42. ^ Jump up to: a b "Archived copy" (PDF). Archived (PDF) from the original on October 9, 2016. Retrieved October 29, 2016.CS1 maint: archived copy as title (link)
  43. ^ "Archived copy" (PDF). Archived (PDF) from the original on October 31, 2016. Retrieved October 30, 2016.CS1 maint: archived copy as title (link)
  44. ^ "Archived copy" (PDF). Archived (PDF) from the original on January 23, 2019. Retrieved January 23, 2019.CS1 maint: archived copy as title (link)
  45. ^ "Archived copy" (PDF). Archived (PDF) from the original on October 31, 2016. Retrieved October 30, 2016.CS1 maint: archived copy as title (link)
  46. ^ "Archived copy" (PDF). Archived (PDF) from the original on October 28, 2016. Retrieved October 27, 2016.CS1 maint: archived copy as title (link)
  47. ^ "Section 23: Enhanced Authorization (EA) Commands", Trusted Platform Module Library; Part 3: Commands (PDF), Trusted Computing Group, March 13, 2014, archived (PDF) from the original on September 3, 2014, retrieved September 2, 2014
  48. ^ Stallman, Richard Matthew, "Can You Trust Your Computer", Project GNU, Philosophy, Free Software Foundation, archived from the original on June 29, 2011, retrieved July 21, 2016
  49. ^ "TrueCrypt User Guide" (PDF). truecrypt.org. TrueCrypt Foundation. February 7, 2012. p. 129. Archived (PDF) from the original on December 25, 2019. Retrieved February 20, 2018 – via grc.com.
  50. ^ "Can You Trust Your Computer? - GNU Project - Free Software Foundation". www.gnu.org. Retrieved August 11, 2021.
  51. ^ "Black Hat: Researcher claims hack of processor used to secure Xbox 360, other products". January 30, 2012. Archived from the original on January 30, 2012. Retrieved August 10, 2017.CS1 maint: bot: original URL status unknown (link)
  52. ^ Szczys, Mike (February 9, 2010). "TPM crytography cracked". HACKADAY. Archived from the original on February 12, 2010.
  53. ^ Scahill, Jeremy ScahillJosh BegleyJeremy; Begley2015-03-10T07:35:43+00:00, Josh (March 10, 2015). "The CIA Campaign to Steal Apple's Secrets". The Intercept. Archived from the original on August 9, 2017. Retrieved August 10, 2017.
  54. ^ "TPM Vulnerabilities to Power Analysis and An Exposed Exploit to Bitlocker – The Intercept". The Intercept. Archived from the original on July 9, 2017. Retrieved August 10, 2017.
  55. ^ Jump up to: a b Seunghun, Han; Wook, Shin; Jun-Hyeok, Park; HyoungChun, Kim (August 15–17, 2018). A Bad Dream: Subverting Trusted Platform Module While You Are Sleeping (PDF). 27th USENIX Security Symposium. Baltimore, MD, USA: USENIX Association. ISBN 978-1-939133-04-5. Archived (PDF) from the original on August 20, 2019.
  56. ^ Jump up to: a b Catalin Cimpanu (August 29, 2018). "Researchers Detail Two New Attacks on TPM Chips". Bleeping Computer. Archived from the original on October 7, 2018. Retrieved September 28, 2019.
  57. ^ Melissa Michael (October 8, 2018). "Episode 14| Reinventing the Cold Boot Attack: Modern Laptop Version" (Podcast). F-Secure Blog. Archived from the original on September 28, 2019. Retrieved September 28, 2019.
  58. ^ "Trusted platform module security defeated in 30 minutes, no soldering required". August 3, 2021.
  59. ^ Goodin, Dan (October 16, 2017). "Millions of high-security crypto keys crippled by newly discovered flaw". Ars Technica. Condé Nast. Archived from the original on October 19, 2018. Retrieved October 18, 2017.
  60. ^ "Can the NSA Break Microsoft's BitLocker? – Schneier on Security". www.schneier.com. Archived from the original on August 10, 2017. Retrieved August 10, 2017.
  61. ^ ""TPM Update - Infineon Technologies"". Archived from the original on February 5, 2021. Retrieved March 19, 2021.
  62. ^ "Trusted Platform Module (TPM) im LAN-Adapter". Heise Online. Archived from the original on January 7, 2019. Retrieved January 7, 2019.
  63. ^ Jump up to: a b "Home – Microchip Technology". www.atmel.com. Archived from the original on October 5, 2016. Retrieved October 4, 2016.
  64. ^ "AN_8965 TPM Part Number Selection Guide – Application Notes – Microchip Technology Inc" (PDF). www.atmel.com. Archived (PDF) from the original on October 5, 2016. Retrieved October 4, 2016.
  65. ^ "Home – Microchip Technology". www.atmel.com. Archived from the original on October 5, 2016. Retrieved October 4, 2016.
  66. ^ "Nuvoton TPM".
  67. ^ "STSAFE-TPM" (PDF).
  68. ^ "Replacing Vulnerable Software with Secure Hardware: The Trusted Platform Module (TPM) and How to Use It in the Enterprise" (PDF). Trusted computing group. 2008. Archived (PDF) from the original on July 14, 2014. Retrieved June 7, 2014.
  69. ^ "NetXtreme Gigabit Ethernet Controller with Integrated TPM1.2 for Desktops". Broadcom. May 6, 2009. Archived from the original on June 14, 2014. Retrieved June 7, 2014.
  70. ^ "Shielded VMs". Google Cloud. Archived from the original on April 12, 2019. Retrieved April 12, 2019.
  71. ^ "libtpms Virtual TPM".
  72. ^ "TPM 2.0 Support Sent In For The Linux 3.20 Kernel - Phoronix". Archived from the original on February 28, 2021. Retrieved April 5, 2020.
  73. ^ "TPM 2.0 Support Continues Maturing In Linux 4.4 - Phoronix". Archived from the original on March 5, 2021. Retrieved April 5, 2020.
  74. ^ "With Linux 4.4, TPM 2.0 Gets Into Shape For Distributions - Phoronix". Archived from the original on August 14, 2020. Retrieved April 5, 2020.
  75. ^ "Chromebook security: browsing more securely". Chrome Blog. Archived from the original on April 25, 2016. Retrieved April 7, 2013.
  76. ^ "Oracle Solaris and Oracle SPARC T4 Servers— Engineered Together for Enterprise Cloud Deployments" (PDF). Oracle. Archived (PDF) from the original on October 24, 2012. Retrieved October 12, 2012.
  77. ^ "tpmadm" (manpage). Oracle. Archived from the original on November 14, 2012. Retrieved October 12, 2012.
  78. ^ Singh, Amit, "Trusted Computing for Mac OS X", OS X book, archived from the original on July 21, 2011, retrieved August 2, 2011.
  79. ^ "Your Laptop Data Is Not Safe. So Fix It". PC World. January 20, 2009. Archived from the original on November 4, 2013. Retrieved August 22, 2013.
  80. ^ "TPM. Complete protection for peace of mind". Winpad 110W. MSI. Archived from the original on May 13, 2013. Retrieved May 20, 2013.
  81. ^ Security and the Virtualization Layer, VMware, archived from the original on November 4, 2013, retrieved May 21, 2013.
  82. ^ Enabling Intel TXT on Dell PowerEdge Servers with VMware ESXi, Dell, archived from the original on March 16, 2014, retrieved May 21, 2013.
  83. ^ "XEN Virtual Trusted Platform Module (vTPM)". Archived from the original on September 15, 2015. Retrieved September 28, 2015.
  84. ^ "QEMU 2.11 Changelog". qemu.org. December 12, 2017. Archived from the original on February 9, 2018. Retrieved February 8, 2018.
  85. ^ "Windows Hardware Certification Requirements". Microsoft. Archived from the original on June 29, 2021. Retrieved July 23, 2013.
  86. ^ "Windows Hardware Certification Requirements for Client and Server Systems". Microsoft. Archived from the original on July 1, 2015. Retrieved June 5, 2015.
  87. ^ "What's new in Hyper-V on Windows Server 2016". Microsoft. Archived from the original on March 25, 2017. Retrieved March 24, 2017.
  88. ^ "Windows 11 update: TPM 2.0 and PC Health Check confusion". SlashGear. June 24, 2021. Archived from the original on June 24, 2021. Retrieved June 24, 2021.
  89. ^ tpmtool | Microsoft Docs
  90. ^ tpmvscmgr | Microsoft Docs
  91. ^ AMD EK RSA Root Certificate
  92. ^ AMD EK ECC Root Certificate
  93. ^ AMD EK Ryzen 6000 RSA Intermediate Certificate
  94. ^ AMD EK Ryzen 6000 ECC Intermediate Certificate
  95. ^ Infineon Root Certificate
  96. ^ Intel EK Root Certificate
  97. ^ Intel EK Intermediate Certificate
  98. ^ NationZ EK Root Certificate
  99. ^ NationZ EK Intermediate Certificate
  100. ^ NationZ EK Intermediate Certificate
  101. ^ NationZ EK Intermediate Certificate
  102. ^ Nuvoton EK Root Certificate 1110
  103. ^ Nuvoton EK Root Certificate 1111
  104. ^ Nuvoton EK Root Certificate 2110
  105. ^ Nuvoton EK Root Certificate 2111
  106. ^ Nuvoton EK Root Certificate 2112
  107. ^ ST Micro EK GlobalSign Certificate
  108. ^ ST Micro EK Root Certificate
  109. ^ ST Micro EK Intermediate Certificate
  110. ^ ST Micro EK Intermediate Certificate
  111. ^ ST Micro EK Intermediate Certificate
  112. ^ ST Micro EK Intermediate Certificate
  113. ^ ST Micro EK Intermediate Certificate
  114. ^ ST Micro EK GlobalSign ECC Certificate
  115. ^ ST Micro EK ECC Root Certificate
  116. ^ ST Micro EK ECC Intermediate Certificate
  117. ^ tpm2-software/tpm2-tss, Linux TPM2 & TSS2 Software, November 18, 2020, archived from the original on November 12, 2020, retrieved November 20, 2020
  118. ^ "IBM TSS for TPM 2.0". Archived from the original on June 29, 2021. Retrieved June 2, 2021.
  119. ^ "IBM TSS for TPM 2.0". Archived from the original on June 29, 2021. Retrieved June 2, 2021.
  120. ^ "IBM TPM Attestation Client Server". Archived from the original on March 2, 2021. Retrieved November 20, 2020.
  121. ^ "IBM TPM Attestation Client Server". Archived from the original on June 29, 2021. Retrieved June 2, 2021.
  122. ^ google/go-tpm, November 18, 2020, archived from the original on December 14, 2020, retrieved November 20, 2020
  123. ^ google/go-attestation, November 19, 2020, archived from the original on November 19, 2020, retrieved November 20, 2020
  124. ^ wolfSSL/wolfTPM, wolfSSL, November 18, 2020, archived from the original on November 20, 2020, retrieved November 20, 2020
  125. ^ TSS.MSR, archived from the original on June 26, 2021, retrieved June 17, 2021
  126. ^ Fraunhofer-SIT/charra, Fraunhofer Institute for Secure Information Technology, August 26, 2020, archived from the original on October 29, 2020, retrieved November 20, 2020
  127. ^ AG, Infineon Technologies. "OPTIGA™ TPM SLI 9670 A-TPM board - Infineon Technologies". www.infineon.com. Archived from the original on August 6, 2020. Retrieved November 20, 2020.
  128. ^ "TPMDeveloper". TPMDeveloper. Archived from the original on December 2, 2020. Retrieved November 20, 2020.
  129. ^ "tpm2-software community". tpm2-software community. Archived from the original on November 30, 2020. Retrieved November 20, 2020.
  130. ^ "Linux TPM2 & TSS2 Software". GitHub. Archived from the original on July 9, 2020. Retrieved November 20, 2020.
  131. ^ "IBM TSS Discussion". Archived from the original on June 29, 2021. Retrieved June 2, 2021.
  132. ^ "IBM TSS Discussion". Archived from the original on June 28, 2021. Retrieved June 22, 2021.
  133. ^ "IBM TPM Discussion". Archived from the original on September 18, 2020. Retrieved June 2, 2021.
  134. ^ "IBM TPM Discussion". Archived from the original on June 29, 2021. Retrieved June 22, 2021.
  135. ^ keylime.dev
  136. ^ https://github.com/keylime/
  137. ^ "Windows 11 TPM 2.0 requirement has a special exception". SlashGear. June 28, 2021. Archived from the original on June 28, 2021. Retrieved June 29, 2021.

Further reading[]

  1. Challener, David; Goldman, Kenneth; Arthur, Will (2015), A Practical Guide to TPM 2.0 (PDF), Apress, doi:10.1007/978-1-4302-6584-9, ISBN 978-1-4302-6584-9, S2CID 27168869.
  2. Trusted Platform Module (TPM) (Work group web page and list of resources), Trusted Computing Group.
  3. PC Client Platform TPM Profile (PTP) Specification (Additional TPM 2.0 specifications as applied to TPMs for PC clients), Trusted Computing Group.
  4. PC Client Protection Profile for TPM 2.0 (Common Criteria Protection Profile for TPM 2.0 as applied to PC clients), Trusted Computing Group.
  5. "OLS: Linux and trusted computing", LWN.
  6. Trusted Platform Module (podcast), GRC, 24:30.
  7. TPM Setup (for Mac OS X), Comet way.
  8. "The Security of the Trusted Platform Module (TPM): statement on Princeton Feb 26 paper" (PDF), Bulletin (press release), Trusted Computing Group, February 2008.
  9. "Take Control of TCPA", Linux journal.
  10. TPM Reset Attack, Dartmouth.
  11. Trusted Platforms (white paper), Intel, IBM Corporation, CiteSeerX 10.1.1.161.7603.
  12. Garrett, Matthew, A short introduction to TPMs, Dream width.
  13. Martin, Andrew, Trusted Infrastructure "101" (PDF), PSU.
  14. Using the TPM: Machine Authentication and Attestation (PDF), Intro to trusted computing, Open security training.
  15. A Root of Trust for Measurement: Mitigating the Lying Endpoint Problem of TNC (PDF), CH: HSR, 2011.
  16. TPM 1.2 Protection Profile (Common Criteria Protection Profile), Trusted Computing Group.
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