中文摘要：

S盒替换与逆S盒替换是AES算法性能的主要瓶颈，它直接影响AES芯片的运算速度．在优化Q—M化简法基础上，提出了一种实现AES算法中s盒替换和逆s盒替换的表达式方法，这种表达式方法相比于普遍使用的查表法，其延时减小了8．5％，面积减小了27．4％，功耗减小了17％．

英文摘要：

S-Box substitution and inverse S-Box substitution are the major bottleneck [or AES algorithm, which directly a{{ect the speed o{ AES chip. On the basis of optimizing Q-M simplifying method, this paper proposes an expression method to implement the S-gox substitution and inverse S-Box substitution in AES algorithm. Compared with the widespread use of the look-up-table method, the expression method can reduce the delay, area and power of circuit by 8. 5%, 27.4% and 17% respectively.