General Structure of Secure Hash Code YL-I CV CVo=IV=initial n-bit value CVi=f(CVi-,Yi1) (1≤i≤L) IV=initial value初始值 H(M)=CVL CV=chaining value链接值 Yi=ith input block(第i个输入数据块) f-compression algorithm(压缩算法) n=length of hash code(散列码的长度) b=length of input block(输入块的长度) 1010