LAUSR

Substitution functions (S-boxes) play an important role in the security of AES-like cryptosystems, but the cryptosystems are highly vulnerable against fault injection attacks. Some research has been carried out previously to prevent fault injection attacks on AES, but most of the countermeasures are restricted to the detection of faults only, and they only work at the cost of large hardware needed for duplicating the S-boxes. In this paper, we present a design construction of fault-resilient S-boxes for AES-like block ciphers by fault detection and correction. The random evolution of cellular automata with linear and nonlinear neighborhood functions is exploited to design these S-boxes. The proposed design guarantees 100 % coverage of single-byte fault correction and double-byte fault detection in the S-boxes. The FPGA implementation shows that our design makes the substitution boxes fault-resilient with 21.34 % extra hardware compared to the AES substitution layer.