国际日期加密算法(想法(16 )) 的安全,微型想法零,对微分密码翻译法被调查。当想法(8 ) 需要 7 时,想法(16 ) 对在 5 个回合以后的微分密码翻译法攻击是安全的结果表演为安全的一样的水平舍入。为想法(16 ) 和它第二最大的大小的特征值的转变矩阵被计算。为转变矩阵的存储方法被优化了加快文件 I/O。工作的强调躺在发现计算矩阵的特征值的一个有效方法。到更低的时间复杂性,在发现特征值的三个成熟算法从对方被比较,潜水艇空间重复算法被采用计算第二个最大的模块的特征值,与 0.001 的精确。
The security of international date encryption algorithm (IDEA(16)), a mini IDEA cipher, against differential cryptanalysis is investigated. The results show that [DEA(16) is secure against differential cryptanalysis attack after 5 rounds while IDEA(8) needs 7 rounds for the same level of security. The transition matrix for IDEA(16) and its eigenvalue of second largest magnitude are computed. The storage method for the transition matrix has been optimized to speed up file I/O. The emphasis of the work lies in finding out an effective way of computing the eigenvalue of the matrix. To lower time complexity, three mature algorithms in finding eigenvalues are compared from one another and subspace iteration algorithm is employed to compute the eigenvalue of second largest module, with a precision of 0.001.