动态化DES算法变体研究

VARIANT OF DYNAMIC DES ALGORITHM

针对数据加密标准(DES)算法密钥短和静态置换数组的缺陷,提出延长密钥并动态化置换数组的DES变体。对DES算法与差分功耗分析进行讨论,提出利用卷积算法生成随机数来达到动态化置换数组的目的。针对延长密钥,提出利用哈希算法生成哈希密钥来解决变体密钥兼容性的问题。与DES算法相比,该变体能够抗暴力破解与差分功耗分析,并具有相近的加密表现(均匀性和雪崩效应)与时间、空间复杂度。同时,该变体较其他的近似变体具有更理想的运行效率。

Aiming at the drawbacks of short key and static permutation array in data encryption standard(DES)algorithm,we propose a variant of DES algorithm by extending the key and dynamically displacing the array.We discussed the DES algorithm and differential power analysis(DPA),and proposed the convolution algorithm to generate random numbers so as to achieve the dynamic permutation array.For the extended key,the hash algorithm was proposed to generate the hash key to solve the problem of variant key compatibility.Compared with the origin DES algorithm,the variant can resist brute force and DPA.It has similar encryption performance in terms of uniformity and avalanche effect and has similar time and space complexity.The variant has better operation efficiency than other approximate variants.