Magtek USB MagnePrint Swipe Reader with Encryption Manual do Utilizador descarregar pdf (Página 71)

APPENDIX C. GUIDE ON DECRYPTING DATA

When a data field consists of more than one block, Cipher Block Chaining (CBC) method is used

by the encrypting algorithm.

To decrypt this group of data, follow these steps:

• Start decryption on the last block.

• The result of the decryption is then XORed with the previous block.

• Continue until reaching the first block.

• The first block can skip the XOR operation.

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Magtek USB MagnePrint Swipe Reader with Encryption Manual do Utilizador Página 71