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I have a version D TR-31 keyblock (which contains an AES Key for use in CMAC), and have the ZCMK key used, what is the method which I can use to extract the key from the TR-31 keyblock? I'll do my own development.

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This is specified in the TR-31 specification, namely ASC X9 TR 31-2018, Interoperable Secure Key Exchange Key Block Specification.

It is copyrighted so I cannot provide a better answer.

You can buy the document at the ANSI web store.

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