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When a block cipher is used for encryption and decryption, the message is divided into blocks of what?
Bits
Bytes
Bauds
Braids
A block cipher is an encryption method that applies a deterministic algorithm along with a symmetric key to encrypt a block of text, rather than encrypting one bit at a time as in stream ciphers. For example, a common block cipher, AES, encrypts 128 bit blocks with a key of predetermined length: 128, 192, or 256 bits. Block ciphers are pseudorandom permutation (PRP) families that operate on a fixed-size block of bits. While the block size can be converted from bits to bytes, it is typically represented by a number of bits.
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