Trying to verify ARQC cryptograms on authorizer side
have tried some available texts , but see divergences on key sizes.
how EMV cryptogram ARQC is culcalated by authorizer?
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Usually ARQC is verified by an HSM( hardware security module ). ARQC requires
Download EMV Book 2 and read section 8.1.2 Application Cryptogram Algorithm and its annexes to have a good understanding. Then you need to read the card's payment scheme's documentation for a dull understanding of the card you are working on.