Details
The Trusted Platform Module (TPM) as specified by the TCG provides many security functions including special registers (called Platform Configuration Registers - PCRs) which hold various measurements in a shielded location in a manner that prevents spoofing. Measurements consist of a cryptographic hash using a Secure Hashing Algorithm (SHA). The current TPM specification uses the SHA-1 hashing algorithm. SHA-1 is a cryptographic hash function designed by the United States National Security Agency (NSA) and published by the United States National Institute of Standards and Technology (NIST) as a U.S. Federal Information Processing Standard (FIPS). A characteristic of the cryptographic hash algorithm is that (for all practical purposes) the hash result (referred to as a hash digest or a hash) of any two modules will only produce same hash value if the modules are identical.
Read more about this topic: Trusted Execution Technology
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