Algebraic Fault Analysis on LBlock under Nibble-Based Fault Model

Abstract

LBlock is a 64-bit lightweight block cipher designed by Wu and Zhang at ACNS 2011, which can be implemented efficiently in both hardware environments and software platforms. This paper proposes an improved fault attack on LBlock by combining algebraic cryptanalysis with differential fault analysis. Our best results show that under nibble-based fault model in the 27-th round, two fault injections are enough to recover the 80-bit master key. To the best of our knowledge, this is the fault attack on LBlock with the least number of fault injections for now.