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A LUT with Hierarchical Structure (HS-LUT) is proposed in this paper to realize the unique nonlinear component, Substitution Box (S-box), of the block ciphers. Different types of S-boxes are analyzed and four important features of them are summarized. Then, custom 4R/1W memory is proposed as the storage unit of the reconfigurable S-box, and an example set of block ciphers is put forward to describe how to achieve a satisfactory structure of reconfigurable S-box. The proposed HS-LUT is applicable for different sets of ciphers and it is implemented under TSMC 40nm CMOS technology to compare with similar work. The comparison result shows that the proposed HS-LUT gains 6.88% to 51.76% area efficiency improvement.

An area-efficient design of reconfigurable S-box for parallel implementation of block ciphers