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How are the PIN and TPM used to derive the volume master key?

April 26, 2017DERIVE key master Pin TPM Used volume

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How are the PIN and TPM used to derive the volume master key?

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BitLocker hashes the user-specified personal identification number (PIN) by using SHA-256, and the first 160 bits of the hash are used as authorization data sent to the TPM to seal the volume master key. The volume master key is now protected by both the TPM and the PIN. To unseal the volume master key, you are required to enter the PIN each time the computer restarts or resumes from hibernation.