基于混沌消息扩展的Hash函数

摘要

构造了一种基于混沌消息扩展的Hash函数，方案中将消息权重矩阵融入时空混沌系统，加强了每个消息块中各字符之间及各消息块之间的联系，构建了统计特性良好的扩展消息，采用4轮64步迭代得到160 bit的消息摘要。和SHA-1算法相比在不明显影响运算效率的前提下安全性得到了提高。%A new Hash function based on chaotic message expansion is constructed, in which message weight matrix is integrated into the spatiotemporal chaotic system, the connection between each character of one message block is strength-ened, and the connection between each message block is also strengthened, the extended message has good statistical properties. A 160 bit message digest is gotten after 4 rounds with 64 steps iteration. Compared with SHA-1 algorithm, the security is improved under the premise that the operation efficiency does not affected too much.