一种分组密码强化安全方法的研究

Study on a Method of Strengthening the Security of Block Cipher

分析了级联加密的特点,讨论了分组密码的三种强化技术:密码级联技术、多重加密技术和白化技术,提出了一种双重级联加密方案NCC,并用现有的级联加密模式进行了比较,分析了其安全性和特点。同时为了减少密钥量,设计了一种密钥生成方案,用两个主密钥生成三个加密密钥,并且分析了它的安全性。

The characteristics of cascade ciphers are analyzed and three strengthened techniques of block cipher：, cipher cascade technique, multiple cipher technique and wipe technique, are discussed. This paper presents a scheme of new double cascade cipher （NCC）, and compares it with the current cascade cipher mode and analyzes its security and characteristics. Moreover, a key generating scheme is designed in order to reduce the length of key, in which three encrypted keys are generated with two main keys and the security of them are analyzed.