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cipher feedback (DES) (CFB)

Key feedback, cipher feedback(CFB), is a block-oriented encryption method like DES encry ption (Data Encryption Standard). In this block cipher, the text block to be ciphered is XORed with the previous text block before it is subsequently encrypted.

Block cipher method

Block cipher method

In contrast to the Cipher Block Chain( CBC), with Cipher Feedback the text block can be adapted to the data length to be transmitted. The block length corresponds to the maximum permissible block length of the algorithm. The block-oriented encryption of the given algorithm thus becomes a continuous encryption, each based on plaintext blocks.

In key feedback, a block cipher is operated as a stream cipher, allowing plaintexts smaller than the block size to be ciphered.

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Englisch: cipher feedback (DES) - CFB
Updated at: 21.07.2016
#Words: 118
Links: feedback, cipher, block, encryption method, destination end station (DES)
Translations: DE
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