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A Concurrent Fault Detection Scheme For The Aes Using Composite Fields

Abstract


The faults that accidentally or maliciously occur in the hardware implementations of the Advanced Encryption Standard (AES) may cause erroneous encrypted/decrypted output. The use of appropriate fault detection schemes for the AES makes it robust to internal defects and fault attacks. In this paper, we present a lightweight concurrent fault detection scheme for the AES. In the proposed approach, the composite field S-box and inverse S-box are divided into blocks and the predicted parities of these blocks are obtained. Through exhaustive searches among all available composite fields, we have found the optimum solutions for the least overhead parity-based fault detection structures. A low-cost parity-based fault detection scheme for the S-box and the inverse S-box using composite fields. For increasing the error coverage, the predicted parities of the five blocks of the S-box and the inverse S-box are obtained (three predicted parities for the multiplicative inversion and two for the transformation and affine matrices). It is interesting to note that the cost of our multi-bit parity prediction approach is lower than its counterparts which use single-bit parity. It also has higher error coverage than the approaches using single-bit parities. We have implemented both the proposed fault detection S-box and inverse S- box and other Counterparts. The complexities of the proposed fault detection scheme are lower. The least area and delay overhead fault detection structures for the optimum composite fields using both polynomial basis and normal basis.


Keywords

AES, composite fields, error coverage, fault detection

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