中文摘要：

提出了一个基于分组密码的hash函数体制，它的rate小于1但却具有更高的效率，同时，这个hash函数可以使用不安全的压缩函数进行构造，降低了对压缩函数安全性的要求．首先，在黑盒子模型下对这个新的体制的安全性进行了证明，然后给出了能够用于构造该体制的使用分组密码构造的压缩函数，最后通过实验对比发现新hash函数的速度比rate为1的hash函数快得多．实验结果表明，除了rate以外，密钥编排也是影响基于分组密码hash函数效率的重要因素。甚至比rate影响更大．该体制只有两个密钥，不需要进行大量的密钥扩展运算，大大提高了基于分组密码hash函数的效率，而且该体制可以使用现有的分组密码来构造．

英文摘要：

In this paper, a hash function with lower rate but higher efficiency is proposed and it can be built on insecure compression functions. The security of this scheme is proved under black-box model and some compression function based on block ciphers are given to build this scheme. It is also shown that key schedule is a more important factor affecting the efficiency of a block-cipher-based hash function than rate. The new scheme only needs 2 keys and the key schedule of it can be pre-computed. It means the new scheme need not re-schedule the keys at every step durin~ the iterations and its efficiency is improved.