BS ISO/IEC 18033-3:2010+A1:2021 - Page 2

Information technology. Security techniques. Encryption algorithms. Block ciphers | Status: Current

1 Scope This part of ISO/IEC 18033 specifies block ciphers. A block cipher maps blocks of n bits to blocks of n bits, under the control of a key of k bits. A total of eight different block ciphers are defined. They are categorized in Table 1. Table 1 — Block ciphers specified Block length Algorithm name (see #) Key length 64 bits TDEA (4.2) 128 or 192 bits MISTY (4.3) 128 bits CAST-128 (4.4) HIGHT (4.5) 128 bits AES (5.2) 128, 192 or 256 bits Camellia (5.3) SEED (5.4) 128 bits SM4 (5.5) The algorithms specified in this part of ISO/IEC 18033 have been assigned object identifiers in accordance with ISO/IEC 9834. The list of assigned object identifiers is given in Annex B. Any changes to the specification of the algorithms resulting in a change of functional behaviour will result in a change of the object identifier assigned to the algorithm.