基于AES的短分组加密技术的改进

Improvement on Short-block Encryption Technology Based on AES

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.