中文摘要：

S盒是构成分组密码算法重要的非线性部件,其密码学性质直接影响整个密码算法的安全性,因此对S盒的安全性检测十分重要。以往对S盒的安全性评估大多数集中在检测分量函数的安全性上,本文考虑了分量函数之间的关系,并利用Shannon在对称密码系统设计中所提出的混淆和扩散的思想,提出了S盒的互相关测试指标,设计了测试算法,更好地评价了S盒的安全性能。对DES和AES的S盒分别进行了实验,给出了测试结果。

英文摘要：

In the past,security assesment on S-box is concentrated on examining the security of each component function,with little regard for the relationship between these functions.Considering this problem,using the idea of confusion and diffusion presented by shannon on symmetric cryptography,we propose the cross-correlation test indicators of an S-box.An algorithm of cross-correlation test is presented,which evaluates the security of the S-box better.Finally,experiments on the S-boxes of DES and AES were undertaken,and the test results are given.