Intel® SGX and Intel® TDX Provisioning Certification Service – Adding TCB Evaluation Data Number Historical Data

Dear Intel® SGX and Intel® TDX Customers,

The “Retrieve TCB Evaluation Data Numbers” endpoint (/{sgx/tdx}/certification/v4/tcbevaluationdatanumbers) response has been supplemented with additional historical data back to late 2022 (tcbEvaluationDataNumber = 13), which is the TCB Recovery immediately prior to the introduction of version 4 APIs of the Intel® SGX and Intel® TDX Provisioning Certification Service.

This has been done to facilitate using date-based appraisal policies, as Intel SGX and Intel TDX ecosystem adoption of attestation appraisal capabilities increases. Reference the Attestation Appraisal section of the [Trusted Computing Base Recovery guidance page](https://www.intel.com/content/www/us/en/developer/topic-technology/software-security-guidance/trusted-computing-base-recovery-attestation.html) or the Guidance for Infrastructure Providers section of the [Trusted Computing Base Recovery technical paper](https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/best-practices/trusted-computing-base-recovery.html) for more details.

Thank You,

Intel SGX & TDX Services Team