Cryptology ePrint Archive: Report 2010/066
Some Observations on TWIS Block Cipher
Bozhan Su and Wenling Wu and Lei Zhang and Yanjun Li
Abstract: The 128-bit block cipher TWIS was proposed by Ojha et al in
2009. It is a lightweight block cipher and its design is inspired
from CLEFIA. In this paper, we first study the properties of TWIS
structure, and as an extension we also considered the generalized
TWIS-type structure which can be called G-TWIS cipher, where the
block size and round number can be arbitrary values. Then we
present a series of 10-round differential distinguishers for TWIS
and a n-round differential distinguisher for G-TWIS whose
probabilities are all equal to 1. Therefore, by utilizing these
kinds of differential distinguishers, we can break the full
10-round TWIS cipher and n-round G-TWIS cipher.
Category / Keywords: secret-key cryptography / Block Cipher, TWIS, G-TWIS, Differential Distinguisher, Differential Cryptanalysis.
Date: received 7 Feb 2010, last revised 8 Feb 2010
Contact author: subozhan at is iscas ac cn
Available formats: PDF | BibTeX Citation
Note: There are some words in Acknowledgment inappropriate, so i delete Acknowledgment. It is my reason for revision.
Version: 20100209:015102 (All versions of this report)
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