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Residual block termination : ウィキペディア英語版
Residual block termination

In cryptography, residual block termination is a variation of cipher block chaining mode (CBC) that does not require any padding. It does this by effectively changing to cipher feedback mode for one block. The cost is the increased complexity.
==Encryption procedure==
If the plaintext length ''N'' is not a multiple of the block size ''L'':
*Encrypt the ⌊''N''/''L''⌋ full blocks of plaintext using the cipher block chaining mode;
*Encrypt the last full encrypted block again;
*XOR the remaining bits of the plaintext with leftmost bits of the re-encrypted block.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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