cipher block chaining


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cipher block chaining

[′sī·fər ‚bläk ‚chān·iŋ]
(communications)
A technique for block chaining in which each block of ciphertext is produced by adding, through the EXCLUSIVE OR operation, the previous block of ciphertext to the current block of plaintext. Abbreviated CBC.
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The dsPIC30F Symmetric Key Encryption/Decryption Library functions support multiple modes of operation, including Electronic Code Book (ECB) mode, Cipher Block Chaining mode (CBC), CBC-based Message Authentication (CBC-MAC) mode, Counter (CTR) mode, and combined CBC-MAC and Counter Mode (CCM).
The X_DES core supports all four standard DES modes: Electronic Code Book (ECB), Cipher Block Chaining (CBC), Cipher Feedback (CFB), and Output Feedback (OFB).
The integrated MAC also includes baseline privacy encryption/decryption for Internet security with 40/56-bit DES Cipher Block Chaining with Residual Block Termination.
Its main additional features will be Cipher Block Chaining (of authentications) and authentication of the counter status.