Stream Cipher and Block Cipher

Stream cipher takes a sequence of bytes and produce a stream of ciphertext. A block cipher handles a single block of data at a time. Stream cipher is like a sausage machine while block cipher is like a bakery. A distinction between the 2 cphers is that the internal state of a stream cipher is continuously updated as data is processed. by contract, the state of a block cipher is reset for each block prior to processing.