摘要： 经对Rijndael算法研究发现,其密文长度通常大于明文长度,且运算时间复杂度较高,不便于对IC卡的数据进行加密。按照IC卡数据加密的实际需求,提出了一种基于Rijndael算法的改进算法。改进的新算法通过用动态密码对明文修补,实现密文与明文的长度相同;通过改进密鈅扩展算法,保障新算法安全;通过减少加密轮次,降低其时间复杂度,从而使其在IC卡数据加密系统中的应用可行。

关键词: IC卡, 加密, Rijndael

Abstract: Research on Rijndael algorithm reveals that the enciphered text length is larger than that of the plain text with high time complexity, which is inconvenient for data encryption in IC card application. According to the requirements of IC card application, this paper proposes an improvement on Rijndael algorithm. The improved algorithm is applicable in IC card data encryption through length equalization by patching on the plain text with dynamic cipher, safety guarantee by extended key schedule algorithm, and time complexity reduction by degrading the number of encrypting rounds.

中图分类号: 

• TP309