Low delay AES S-box designs based on matrix merging method

[摘要] In this paper, a low delay circuit structure is proposed for composite field S-box circuit. In the low delay structure, the multiplications over GF((22)2) are constructed by XOR-AND-XOR-networks, and the multiplicative inverse over GF((22)2) are constructed by AND-XOR-networks. As XOR-networks are linear operations, they can be further expressed as constant matrix multiplications. In this paper, the adjacent matrix multiplications in S-box are merged to reduce the delay. Compared with previous works, our S-box implementations have lower delay.

[学科分类] 电子、光学、磁材料

[关键词] advanced encryption standard;S-box;composite field;critical path delay;constant matrix multiplications