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2019-07-04T06:15:52Z

Created page with "In cryptography, '''residual block termination''' is a variation of cipher block chaining mode (CBC) that does not require any padding. It d..."

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In [[cryptography]], '''residual block termination''' is a variation of [[cipher block chaining]] mode (CBC) that does not require any [[Padding (cryptography)|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 (cryptography)|block size]] ''L'':
*Encrypt the ⌊''N''/''L''⌋ full blocks of plaintext using the [[cipher block chaining]] [[block cipher modes of operation|mode]];
*Encrypt the last full encrypted block again;
*[[XOR]] the remaining bits of the plaintext with leftmost bits of the re-encrypted block.

==Decryption procedure==
*[[Decrypt]] the ⌊''N''/''L''⌋ full encrypted blocks using the Cipher Block Chaining mode;
*Encrypt the last full encrypted block;
*[[XOR]] the remaining bits of the ciphertext with leftmost bits of the re-encrypted block.

==Short message==
For messages shorter than one [[Block size (cryptography)|block]], residual block termination can use an encrypted [[Initialization vector|IV]] instead of the previously encrypted block.

==Source==

[http://wikipedia.org/ http://wikipedia.org/]
==See Also on BitcoinWiki==
* [[IdealCoin]]
* [[Bitcoin Press Center]]
* [[BitNewt]]
* [[Public relations]]
* [[KEY Difference Media]]

Residual block termination - Revision history

Admin: Created page with "In cryptography, '''residual block termination''' is a variation of cipher block chaining mode (CBC) that does not require any padding. It d..."