Differential Cryptanalysis of Round-Reduced SIMON32 and SIMON48 and SIMON64

On June 2013, Beaulieu and et.al from the U.S National Security Agency proposed a family of block ciphers, SIMON. This family of block ciphers is classified as lightweight block ciphers that comes in a variety of widths and key sizes. SIMON offers excellent performance on hardware and software platforms from which hardware performance is optimal. The main purpose of this paper is to provide improved differential attacks proposed on this family of block ciphers. Getting help from the new ideas and viewpoints about methods and key-guessing policies, we improve differential attack on 22-round SIMON32, 23-round SIMON48 and 29-round SIMON64. This attack adds one round to the latest differential cryptanalysis presented before this paper submission.