基于子密钥数据的加密算法研究  

Encryption algorithm based on sub-keys

作　　者：张沪寅[1] 吴产乐[1] 邢建兵[1] 吴黎兵[1] 华宇[1] 

机构地区：[1]武汉大学计算机学院,湖北武汉430072

出　　处：《哈尔滨工业大学学报》2005年第4期485-487,576,共4页Journal of Harbin Institute of Technology

基　　金：国家高技术研究发展计划资助项目(2003AA001032)湖北省自然科学基金资助项目(2001B057)

摘　　要：针对对称密码体制存在的密文保密强度和抗分析破译性较差的缺陷,提出了一种基于子密钥变换产生轮密钥对数据进行分段加密的方法,通过对明文进行变换处理,利用随机产生的独立子密钥,按信息位的判定产生不同的轮密钥,并对每轮分组变换进行加密.阐述了子密钥生成模块、子密钥变换轮密钥进行加解密算法的过程,并对算法性能进行了详细分析.测试数据表明,该算法比同类型的加密算法速度快,而且加密方法的变型性以及轮密钥选取的随机性将增强加密算法的抗攻击性.Symmetric Key Cryptography System has a serious defect of low quality in confidential strength and analysis resistance. So a block encryption method based on round key produced by sub-key transition is proposed. Transition to the plaintext, produce our round key using randomized independent sub-key, base on the judgment on information bits and encryption transitions in every round. The processes of the production of sub-key mode, the transition from sub-key to round key, the encryption and decryption are illustrated. Testing data shows that this encryption algorithm is faster than conventional ones and its anti-attack ability is reinforced by encryption improvement and randomization.

关 键 词：子密钥 轮密钥 加密算法 信息安全 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]