NDLI: A Detailed Analysis of SAFER K

Content Provider	Springer Nature Link
Author	Knudsen, Lars R.
Copyright Year	2000
Abstract	In this paper we analyze the block cipher SAFER K. First, we show a weakness in the key schedule, that has the effect that for almost every key there exists on the average three and a half other keys such that the encryptions of plaintexts different in one of eight bytes yield ciphertexts also different in only one byte. Moreover, the differences in the keys, plaintexts, and ciphertexts are in the same byte. This enables us to do a related-key chosen plaintext attack on SAFER K, which finds the secret key. Also, the security of SAFER K, when used in standard hashing modes, is greatly reduced, which is illustrated. Second, we propose a new key schedule for SAFER K avoiding these problems. Third, we do differential cryptanalysis of SAFER K. We consider truncated differentials and apply them in an attack on five-round SAFER K, which finds the secret key much faster than by an exhaustive search.
Starting Page	417
Ending Page	436
Page Count	20
File Format	PDF
ISSN	09332790
Journal	Journal of Cryptology
Volume Number	13
Issue Number	4
e-ISSN	14321378
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2000-03-21
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Coding and Information Theory Computational Mathematics and Numerical Analysis Combinatorics Probability Theory and Stochastic Processes Communications Engineering, Networks
Content Type	Text
Resource Type	Article
Subject	Applied Mathematics Computer Science Applications Software

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