Block Cipher


A block cipher is a cryptographic algorithm that encrypts fixed size groups of bits, called blocks, with a specific key. The input message is divided into blocks of fixed size and each block is encrypted separately. The same key is used for both encryption and decryption. Block ciphers are widely used in modern cryptography to provide confidentiality and integrity of data. The security of a block cipher depends on the key size, the block size, and the strength of the encryption algorithm.


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