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0引言密码技术是保护信息安全的主要手段之一,它既具有保证信息机密性的信息加密功能,也具有数字签名、身份验证、秘密分存、系统安全等功能。使用密码技术不仅可以保证信息的机密性,而且可以保证信息的完整性和确定性,防止信息被篡改、伪造和假冒。传统的加密技术一般是对称密钥技术,也称单密钥加密技术,比如数据加密标准DES。也就是说,消息发送者使用一把密钥将消息加密,而消息接收者必须使用同一密钥将密文进行解
0 Introduction Cryptography is one of the main means to protect information security. It not only has the function of information encryption to ensure the confidentiality of information, but also has the functions of digital signature, authentication, secret sharing, system security and so on. The use of cryptography not only ensures the confidentiality of information, but also ensures the integrity and certainty of the information and prevents the information from being tampered with, counterfeiting and counterfeiting. Traditional encryption technology is generally symmetric key technology, also known as single-key encryption technology, such as data encryption standard DES. That is, the sender of the message uses a key to encrypt the message, and the recipient of the message must use the same key to decrypt the ciphertext