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针对传统AES加密算法中S盒数学基代数表达式项数较少,导致其复杂度较低而降低了无线网络安全性问题,提出一种改进的S盒,用于替代传统的S盒方案。对此,文章首先对传统的AES加密算法原理进行分析,并得到传统的S盒采用有限域的迭代方式造成其迭代输出周期短,导致输出的遍历性不强,最终使得其安全性降低;其次,针对上述的分析,提出一种改进S盒的最佳仿射变换,最终提高其仿射周期和迭代输出周期,进而提升整体的安全效率;最后,利用Viso 2013平台对上述的改进方法进行验证,证明新的S盒在提升密码的复杂度方面有较好的效果。
For the traditional AES encryption algorithm, the number of S-box maths based on algebraic expressions is less, which leads to lower complexity and lowers the security of wireless networks. An improved S-box is proposed to replace the traditional S-box scheme. In this regard, the article first analyzes the principle of the traditional AES encryption algorithm, and obtains the iterative method of the finite field of the traditional S-box resulting in a short period of its iterative output, resulting in ergodicity of the output is not strong, eventually making it less secure; secondly In view of the above analysis, an improved affine transformation is proposed to improve the S-box, and finally the affine period and the iterative output period are increased to improve the overall safety efficiency. Finally, the improved method is verified by the Viso 2013 platform , Prove that the new S-box has a good effect in enhancing the complexity of the password.