Cipher Block Chaining (CBC)

• Each plaintext block is XORed with the previous encrypted block
  C_n = E(P_n XOR C_{n - 1}, K)
• Patterns in plaintext are concealed
• An error is only propagated one block
• Can do random access decryption (one block look backwards required)
• Subject to some cut and splice attacks
• Last block can be used as a message authentication code (MAC) since it depends on all the message and the key

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 Last change: Saturday, June 7, 2003 11:46 am
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