![]() ![]() It’s important to understand that in credit card readers, each transaction produces data that will be encrypted using a different key. For this, you’ll need to understand ANSI X9.24-1, otherwise known as DUKPT. Assuming you have the correct 16-byte decryption key, the decryption process is easy. ![]() You’ll likely use any of a number of existing open-source implementations of TDES or AES (there’s no need to implement core crypto routines yourself), operating in CBC ( Cipher Block Chaining) mode, with a default initial vector of all zero bytes. The decryption process itself is gratifyingly anticlimactic. The answer is: You need to obtain the proper session key for the transaction, and then use that key to decrypt the data payload via Triple-DES (or AES, as appropriate). ![]() A question that comes up a lot is: The track data I’m getting from my ID TECH credit card reader is encrypted. ![]()
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