Cipher block chaining (CBC) 32  CBC uses c i as r i+1 (the ith ciphertext block used as the (i+1)th random number.)  CBC encryption:  c 0  IV  c i  E(m i  c i-1 ) for i > 0  CBC decryption:  c 0  IV  m i  D(c i )  c i-1 for i > 0
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