Date of Publication :7th June 2016

Abstract: This paper presents a combinational logic based Rijndael S-Box implementation for the Sub Byte transformation in the Advanced Encryption Standard (AES) algorithm. Recent publications on AES implementation have shown that the combinational logic based S-Box is proven for its small area occupancy and high throughput, given the fact that pipelining can be applied to this SBox implementation as compared to the typical based lookup table implementation which access time is fixed and unbreakable. In this paper, the construction procedure for implementing a 2 stage pipeline combinational logic based S-Box is presented and illustrated in a step-by-step manner. Implementation of shift row, mixed column, ad round key with DNA keys are done.Finally, for the purpose of practicality, the depth of the mathematics involved has been reduced in order to allow the reader to better understand the internal operations within the S-Box. A worked example by hand is also provided to help the reader better understand the functionality of the internal operations.

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