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The keyARN of the CVK encryption key that Amazon Web Services Payment Cryptography uses to verify CVV or CSC.

The key check value (KCV) of the encryption key. The KCV is used to check if all parties holding a given key have the same key or to detect that a key has changed. Amazon Web Services Payment Cryptography calculates the KCV by using standard algorithms, typically by encrypting 8 or 16 bytes or "00" or "01" and then truncating the result to the first 3 bytes, or 6 hex digits, of the resulting cryptogram.