Cryptanalysis of WG-7 : a lightweight stream cipher

Mohammad Ali, Orumiehchiha, Pieprzyk, Josef, & Steinfeld, Ron (2012) Cryptanalysis of WG-7 : a lightweight stream cipher. Cryptography and Communications, 4(3-4), pp. 277-285.

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Abstract

WG-7 is a stream cipher based on WG stream cipher and has been designed by Luo et al. (2010). This cipher is designed for low cost and lightweight applications (RFID tags and mobile phones, for instance). This paper addresses cryptographic weaknesses of WG-7 stream cipher. We show that the key stream generated by WG-7 can be distinguished from a random sequence after knowing 213.5 keystream bits and with a negligible error probability. Also, we investigate the security of WG-7 against algebraic attacks. An algebraic key recovery attack on this cipher is proposed. The attack allows to recover both the internal state and the secret key with the time complexity about 2/27.

Impact and interest:

10 citations in Scopus
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6 citations in Web of Science®

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55 since deposited on 27 Mar 2014
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ID Code: 69329
Item Type: Journal Article
Refereed: Yes
Keywords: WG-7 stream cipher, Cryptanalysis, Key recovery attack, Distinguishing attack, WG stream cipher
DOI: 10.1007/s12095-012-0070-x
ISSN: 1936-2455
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2012 Springer Science + Business Media, LLC
Copyright Statement: The final publication is available at Springer via http://dx.doi.org/10.1007/s12095-012-0070-x
Deposited On: 27 Mar 2014 00:39
Last Modified: 05 Apr 2014 03:25

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