标准摘要
[中文适用范围]： ISO/IEC 18033 的这一部分指定了密码。 分组密码在 k 位密钥的控制下将 n 位块映射到 n 位块。 总共定义了六种不同的分组密码。 ISO/IEC 18033 本部分中规定的算法已根据 ISO/IEC 9834 分配了对象标识符。 附件 B 中给出了分配的对象标识符列表。 算法规范的任何更改都会导致功能的更改行为将导致分配给算法的对象标识符发生变化。 [外文原描述]： ISO/IEC 18033 specifies encryption systems (ciphers) for the purpose of data confidentiality. ISO/IEC 18033-3:2005 specifies block ciphers. A block cipher is a symmetric encipherment system with the property that the encryption algorithm operates on a block of plaintext, i.e. a string of bits of a defined length, to yield a block of ciphertext. ISO/IEC 18033-3:2005 specifies the following algorithms. 64-bit block ciphers: TDEA, MISTY1, CAST-128.128-bit block ciphers: AES, Camellia, SEED. NOTE The primary purpose of encryption (or encipherment) techniques is to protect the confidentiality of stored or transmitted data. An encryption algorithm is applied to data (often called plaintext or cleartext) to yield encrypted data (or ciphertext); this process is known as encryption. The encryption algorithm is designed so that the ciphertext yields no information about the plaintext except, perhaps, its length. Associated with every encryption algorithm is a corresponding decryption algorithm, which transforms ciphertext back into its original plaintext.
英文名称Information technology - Security techniques - Encryption algorithms - Part 3: Block ciphers