This standard establishes seven operation modes for block cipher to standardize the application of block cipher.
2 Normative References
The following documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding any corrigendum), or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For any undated references, the latest edition of the document referred to applies.
GB/T 1988-1998 Information Technology—7-bit Coded Character Set for Information Interchange (eqv ISO/IEC 646:1991)
3 Terms and Definitions
For the purposes of this standard, the following terms and definitions apply.
3.1 Terms
3.1.1
block chaining (BC) operation mode
one operation mode for block cipher, which is applied to obtain the current ciphertext block by encryption after XOR operation on the current plaintext block with the XOR values of all preceding ciphertext blocks
3.1.2
block cipher
also called block cipher algorithm, a kind of symmetric encryption algorithm which encrypts the plaintext divided into blocks of fixed length
