TCG - SD Association
TCG
Developers
SD Standard Overview
SD Family
Capacity (SD/SDHC/SDXC/SDUC)
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SD Express Implementation Overview - In short videos and articles
SD Express Member Products
Boot and Extended Security Features (RPMB and TCG)
Boot (secured and fast)
TCG
RPMB
Speed Class
Application  Performance Class
Low Voltage Signaling
Content Protection
Host Controllers
SDIO/iSDIO
Wireless LAN SD
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smartSD
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SD Express / UHS-II Verification Program (SVP) Verified Product
How to Start Using SD Standards in Your Product
Use and Licensing
Developers
Developers
SD Standard Overview
SD Family
Capacity (SD/SDHC/SDXC/SDUC)
Bus Speed (Default Speed/High Speed/UHS/SD Express)
SD Express Implementation Overview - In short videos and articles
SD Express Member Products
Boot and Extended Security Features (RPMB and TCG)
Boot (secured and fast)
TCG
RPMB
Speed Class
Application  Performance Class
Low Voltage Signaling
Content Protection
Host Controllers
SDIO/iSDIO
Wireless LAN SD
TransferJet SD
ASSD
smartSD
Embedded SD
Application Formats
SD-Audio
SD-Video
SD-Binding
SD-SD
SD-SD eBook
SD Express / UHS-II Verification Program (SVP) Verified Product
How to Start Using SD Standards in Your Product
Use and Licensing
TCG Storage in SD Memory cards
The Trusted Computing Group (TCG) provides open standards for secure computing, including enterprise storage and mobile devices, to name a few. Thousands of vendors offer a variety of TCG-based products, including hardware, applications and services. TCG was adopted in the market mainly for self encrypted drive (SED) applications. The TCG Storage protocol was already defined to be used over NVMe and other various command layer protocols.
SD Specification Part 1 v9.0, along with the Extended Security Addendum v1.0, defines how TCG may be used on SD memory cards, either through the SD protocol over the SD interface or through the NVMe protocol over the PCIe interface on SD Express cards.
The use of TCG through the NVMe interface in SD Express cards is the same as defined in NVMe standards.
In order to allow TCG support over the SD protocol two new commands were added – ACMD53 and ACMD54 correspond to IF-RECV and IF-SEND respectively and are defined in TCG Storage Architecture Core Specification. These two commands are generic and may be used to transfer transparently other security protocols over SD protocol (RPMB feature is using them as well).
TCG specifications define the Storage Interface Interaction Specification (SIIS) used with SD protocol.
TCG storage performs two major functions:
Encrypt/Decrypt (AES) automatically any user data written/read to/from the user area of the card
May Lock/Unlock access to the user area.
It serves as access protection if the user area access is locked or as data protection, if the storage media is removed from the host.
TCG function may be supported by any SD, SD UHS-I or SD Express cards. TCG is not defined for UHS-II mode and cannot be implemented in UHS-II cards.
Further detailed explanation about TCG and its usage as SED with NVMe may be found in the following link: