About

A block cipher is an encryption algorithm which encrypts fixed-size blocks of plaintext to same-sized blocks of ciphertext. For good ciphers every bit of the ciphertext block depends on every bit of the plaintext block and every bit of the key.

In practice, block ciphers are usually used with a mode of operation, effectively creating stream ciphers from them.

Known block ciphers are , , ,.

history | excerpt history