Definitions for "Block cipher"
An encryption code that works on one fixed-size block of data at a time - unlike a stream cipher, which encrypts data as a stream of bits, one bit at a time. Examples of block ciphers include Data Encryption Standard (DES), Rivest Cipher 2 (RS2) and Rivest Cipher 5 (RS5). See stream cipher, DES, RS2 and RS5.
a method for encrypting data in chunks (several or many contiguous bits) as opposed to encoding bit-by-bit like a stream cipher
a method of encrypting plaintext (to produce ciphertext) in which a cryptographic key (e
a mathematical function , typically implemented in modern times by a computer program function , that takes two inputs and produces one output