论文部分内容阅读
The security of SPECK under impossible differential cryptanalysis is studied.Based on multiple 6-round impossible differential distinguishers and combined with the divide-and-conquer attack and time-and-memory tradeoff,the improved 10-round impossible differential cryptanalysis of SPECK32/64 and SPECK48/96 is presented by adding one round forward and three rounds backward.In addition,by further analyzing the properties of the differential diffusion of addition,many 7-round impossible differential distinguishers of SPECK families of block ciphers are constructed.And the 11-round impossible differential cryptanalysis of SPECK32/64 and SPECK48/96 is presented by adding one round forward and three rounds backward.