A High Throughput CFA AES S-Box with Error Correction Capability

Abstract

The Advanced Encryption Standard (AES) has been lately accepted as the symmetric cryptography standard for confidential data transmission. The AES cipher is specified as a number of repetitions of transformation rounds that convert the input plain-text into the final output of cipher-text. Each round consists of several processing steps, including one that depends on the encryption key. A set of reverse rounds are applied to transform cipher-text back into the original plain-text using the same encryption key. The proposed schemes are independent of the way the S-box and the inverse S-box are constructed. Therefore, they can be used for both the S-boxes and the inverse S-boxes using lookup tables and those utilizing logic gates based on composite fields. Furthermore, for each composite field constructions, there exists eight possible isomorphic mappings. Therefore, after the exploitation of a new common sub expression elimination algorithm, the isomorphic mapping that results in the minimal implementation area cost is chosen. High throughput hardware implementations of the proposed CFA AES S-boxes are reported. In order to avoid data corruption due to SEU's a novel fault tolerant model of AES is presented which is based on the Hamming error correction code. This reduces the data corruption and increases the performance.Thus the data corruption due to Single Event Upset can be avoided and the performance is increased.