Cela permet de garantir que même si le texte brut contient de nombreux blocs identiques, chacun d'eux sera chiffré à l'aide d'un bloc de texte de chiffrement différent. Si le texte brut à chiffrer contient de nombreuses répétitions, le texte de chiffrement peut être déchiffré bloc par bloc.If the plain text to be encrypted contains substantial repetition, it is feasible for the cipher text to be broken one block at a time. In the case of DES, b = 64 and in the case of AES, b = 128. The initialization vector is combined with the first plain text block by a bitwise exclusive OR operation before the block is encrypted. This mode is a most straightforward way of processing a series of sequentially listed message blocks. Par conséquent, les incréments de texte brut suivants sont tronqués jusqu'à ce que le bit incorrect soit exclu du registre à décalage.

Any blocks of plain text that are identical and in the same message, or that are in a different message encrypted with the same key, will be transformed into identical cipher text blocks. Les chiffrements par bloc utilisent le même algorithme de chiffrement pour chaque bloc. If the plain text to be encrypted contains substantial repetition, it is feasible for the cipher text to be broken one block at a time. Ce mode utilise un registre à décalage d'un bloc de longueur, qui se décompose en sections. Le mode CFB (Cipher Feedback) convertit de petits incréments de texte brut en texte de chiffrement, au lieu de convertir tout un bloc.The Cipher Feedback (CFB) mode processes small increments of plain text into cipher text, instead of processing an entire block at a time. Si un bit du texte de chiffrement est tronqué, un bit du texte brut est également tronqué ; en outre, le registre à décalage est endommagé.If a bit in the cipher text is mangled, one plain text bit is mangled and the shift register is corrupted. Cela permet de garantir que même si le texte brut contient de nombreux blocs identiques, chacun d'eux sera chiffré à l'aide d'un bloc de texte de chiffrement différent.This ensures that even if the plain text contains many identical blocks, they will each encrypt to a different cipher text block. Cipher Feedback Mode (CFB) – In this mode the cipher is given as feedback to the next block of encryption with some new specifications: first an initial vector IV is used for first encryption and output bits are divided as set of s and b-s bits the left hand side s bits are selected and are applied an XOR operation with plaintext bits. However, it is possible to convert a block cipher into a stream cipher, using one of the three modes to be dis- cussed in this and the next two sections: cipher feedback (CFB) mode, output feed- back (OFB) mode, and counter (CTR) mode.

The default feedback size can vary by algorithm, but is typically either 8 bits or the number of bits of the block size. Cipher feedback. Le mode OFB (Output Feedback) convertit de petits incréments de texte brut en texte de chiffrement, au lieu de convertir tout un bloc.The Output Feedback (OFB) mode processes small increments of plain text into cipher text instead of processing an entire block at a time. Si un seul bit du bloc de texte de chiffrement est tronqué, le bloc de texte brut correspondant est également tronqué. Other modes, such as CCM and GCM, offer authenticated encryption which includes an integrity assurance over the encrpyted data.. CFB does not require the plain text be padded to the block size of the cipher. Par conséquent, les incréments de texte brut suivants sont tronqués jusqu'à ce que le bit incorrect soit exclu du registre à décalage.This results in the next several plain text increments being mangled until the bad bit is shifted out of the shift register. Ce mode utilise un registre à décalage d'un bloc de longueur, qui se décompose en sections.This mode uses a shift register that is one block in length and is divided into sections. Les chiffrements par bloc utilisent le même algorithme de chiffrement pour chaque bloc.Block ciphers use the same encryption algorithm for each block. Étant donné que chaque bloc est traité de manière intensive, les chiffrements par bloc offrent un niveau de sécurité plus élevé que les chiffrements de flux.

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