改进的PMAC及安全性分析

摘要

According to the forgery attack on PMAC proposed by Lee Changhcon et al,the weakness is found.The method to pro-cess the last block of message is proposed to avoid the forgery attack by using the fact that the block cipher has same output with the same input using a key.The security of the improved scheme is analysed.%针对Lee Changhoon等人对PMAC工作模式提出的伪造攻击,找到PMAC被攻击的弱点.改进了PMAC最后一个消息块的处理方式,避免了利用分组密码在同一个密钥下相同输入有相同输出这一特点进行的伪造攻击,并给出了改进方案的安全性分析.