RT Journal Article
A1 Lei Zhang
AD State Key Laboratory of Cryptology, P.O. Box 5159, Beijing 100878, People's Republic of China
AD TCA, Institute of Software, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
A1 Wenling Wu
AD State Key Laboratory of Computer Science, Institute of Software, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
AD TCA, Institute of Software, Chinese Academy of Sciences, Beijing 100190, People's Republic of China

PB iet
T1 Analysis of permutation choices for enhanced generalised Feistel structure with SP-type round function
JN IET Information Security
VO 11
IS 3
SP 121
OP 128
AB Since the proposition of improved generalised Feistel structure (GFS), many researches and applications have been published. In this study, the authors further enhance the improved GFS with SP-type round function by extending the sub-block-wise permutation to word-wise permutation which can have better diffusion and security effect. Then, they study the security effect of different permutation choices for this kind of enhanced GFS cipher with SP-type round function. By proving several propositions about the equivalent situation, they can eliminate isomorphic permutations so as to narrow down the candidate space notably and propose a method to compute the number of effective permutation candidates. Finally, they take three typical scenes as example, and for each experimental scene, they compute the number of effective permutation candidates and exhaustively evaluate their security results. They also give an optimum permutation as example for each scene.
K1 generalised Feistel structure enhancement
K1 SP-type round function
K1 isomorphic permutations eliminate
K1 permutation choices analysis
K1 subblock-wise permutation
K1 security effect
K1 word-wise permutation
K1 GFS improvement
DO https://doi.org/10.1049/iet-ifs.2015.0433
UL https://digital-library.theiet.org/;jsessionid=3qrc27759i821.x-iet-live-01content/journals/10.1049/iet-ifs.2015.0433
LA English
SN 1751-8709
YR 2017
OL EN