Open AccessImpossible differential cryptanalysis of MARS‐like structures
Author(s) -
Xue Weijia,
Lai Xuejia
Publication year - 2015
Publication title -
iet information security
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.308
H-Index - 34
eISSN - 1751-8717
pISSN - 1751-8709
DOI - 10.1049/iet-ifs.2014.0183
Subject(s) - block cipher , impossible differential cryptanalysis , mars exploration program , differential (mechanical device) , cryptanalysis , mathematics , higher order differential cryptanalysis , block structure , differential cryptanalysis , computer science , cryptography , algorithm , astrobiology , physics , statistics , estimator , thermodynamics
The MARS‐like structure is a generalised Feistel structure. Unified impossible differential (UID) method is an effective method to discover impossible differential characteristics for block cipher structures. In this study, for a specific kind of MARS‐like structure, the authors use UID to show that when n , the number of subblocks, is even, there always exist 3 n − 1 rounds impossible differentials. Moreover, the authors prove that when n is odd, the MARS‐like structure has impossible differentials for any number of rounds, which is a clear but interesting result.