Katholieke Universiteit Leuven
The cryptanalytic method combining differential cryptanalysis and algebraic cryptanalysis has been a focus topic in the field of the cryptanalysis of symmetric ciphers. At FSE 2009 the researchers propose new differential-algebraic attacks, which they claim improves the results of the differential cryptanalysis. In this paper, the authors revisited albrecht's cryptanalytic method and identified that the time complexity to identify the right pairs is not correct. They showed that attack C cannot be used to filter out the wrong pairs satisfying the difference value of the cipher-texts for most block ciphers to improve the differential cryptanalysis.