基于AES的短分组加密技术的改进  

Improvement on Short-block Encryption Technology Based on AES

作　　者：刘连浩[1] 崔杰[1] 胡睿达[1] 刘上力[1] 

机构地区：[1]中南大学信息科学与工程学院,长沙410083

出　　处：《计算机工程》2007年第14期157-159,共3页Computer Engineering

摘　　要：介绍了基于AES的短分组加密算法,研究并指出算法中S盒的大小对加密性能有很大影响。通过求逆、作仿射变换构造了新的十进制S盒,空间是原先的10倍。将新S盒应用于短分组加密仿真系统中,分析发现其增强了算法的抗攻击能力,提高了算法的安全性。实验仿真结果表明,新S盒使加解密的各项扩散率指标有明显提高,加密过程中密钥对密文的扩散率提高了25%。This paper introduces the short-block encryption algorithm based on AES, studies the S-box of the algorithm, and points out that the size of S-box has great influence on encryption performance. The new decimal S-box is constructed by taking multiplicative inverse and applying affine transformation, and its size is 10 times of the original one. And the new S-box is applied in the short-block encryption simulation system, and it shows that the new S-box strengthens the resistance of the algorithm against attack and improves the security of the encryption algorithm. Experiments and simulation indicate that the new S-box improves all the diffusion rate, during which the key to cipher in encryption process increases by 25 percent.

关 键 词：短分组 AES S盒 加密 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构]