Multiple modular additions and crossword puzzle attack on NLSv2

Cho, Joo Yeon & Pieprzyk, Josef (2007) Multiple modular additions and crossword puzzle attack on NLSv2. Lecture Notes in Computer Science : Information Security, 4779, pp. 230-248.

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Abstract

NLS is a stream cipher which was submitted to the eSTREAM project. A linear distinguishing attack against NLS was presented by Cho and Pieprzyk, which was called Crossword Puzzle (CP) attack. NLSv2 is a tweak version of NLS which aims mainly at avoiding the CP attack. In this paper, a new distinguishing attack against NLSv2 is presented. The attack exploits high correlation amongst neighboring bits of the cipher. The paper first shows that the modular addition preserves pairwise correlations as demonstrated by existence of linear approximations with large biases. Next, it shows how to combine these results with the existence of high correlation between bits 29 and 30 of the S-box to obtain a distinguisher whose bias is around 2^−37. Consequently, we claim that NLSv2 is distinguishable from a random cipher after observing around 2^74 keystream words.

Impact and interest:

3 citations in Scopus
3 citations in Web of Science®
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ID Code: 74265
Item Type: Journal Article
Refereed: Yes
Additional Information: Paper presented in the 10th International Conference, ISC 2007, Valparaíso, Chile, October 9-12, 2007
DOI: 10.1007/978-3-540-75496-1_16
ISSN: 0302-9743
Divisions: Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 22 Jul 2014 04:30
Last Modified: 22 Jul 2014 23:22

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