RMAC MAC研究与改进

Research and Improvement of RMAC MAC

相关文献提出的RMAC模式把应用MAC的消息空间扩展到了∑上,对实时数据应用MAC提供了理论依据.然而,该模式在格式化消息时,不加区别地对所有长度的消息都要追加一个PAD,这就使得当消息M的长度恰好是块密码(blockcipher)输入块长度b的整数倍时,需多追加一个完整的冗余块,相应地多一次块密码的调用,降低了RMAC模式的效率.文章对此问题提出了改进措施.

The mode of RMAC referred in the relative literature extends the message space to ∑^＊, providing a theoretic base to the real-time data using of MAC. But the message in the formatting of the RMAC mode does not distinguish the lengths of the messages and append a PAD to them. This makes that if the length of one message is just positive intigral time of the input block length of the block cipher, then it＇ll be added to an entire extra block, which uses a block cipher call once more, accordingly the efficiency of RMAC mode will be reduced. This paper puts forward an improvement of the problem.