olemus
ISO/IEC 10116, 18033-1 jt:
plokkšiffer
n-bitiste avatekstiplokkidega ja
n-bitiste krüptogrammiplokkidega
=
block cipher with the property that plaintext blocks and ciphertext blocks are n bits in length

näide
https://en.wikipedia.org/wiki/Block_cipher
(the Standard model subsection)