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Resilience to distinguishing attacks on WG-7 cipher and their generalizations. (English) Zbl 1283.94065
Summary: The stream cipher WG-7 is a lightweight variant of the well-known Welch-Gong (WG) stream cipher family, targeted to resource-constrained devices like RFID tags, smart cards, and wireless sensor nodes. Recently, a distinguishing attack was discovered against the stream cipher WG-7 by M. A. Orumiehchiha et al. [Cryptogr. Commun. 4, No. 3–4, 277–285 (2012; Zbl 1285.94087)]. In this paper, we extend their work to a general distinguishing attack and suggest criteria to protect the WG stream cipher family from this attack. Our analysis shows that by properly choosing the minimal polynomial of the linear feedback shift register for a WG stream cipher, the general distinguishing attack can be easily thwarted.
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References:
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