State convergence in the initialisation of the Sfinks stream cipher

Authors:
Ali Alhamdan;Harry Bartlett;Leonie Simpson;Ed Dawson;Kenneth Koon-Ho Wong
Affiliations:
Queensland University of Technology, Brisbane Qld, Australia;Queensland University of Technology, Brisbane Qld, Australia;Queensland University of Technology, Brisbane Qld, Australia;University of Technology, Brisbane Qld, Australia;University of Technology, Brisbane Qld, Australia
Venue:
AISC '12 Proceedings of the Tenth Australasian Information Security Conference - Volume 125
Year:
2012

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Abstract

Sfinks is a shift register based stream cipher designed for hardware implementation. The initialisation state update function is different from the state update function used for keystream generation. We demonstrate state convergence during the initialisation process, even though the individual components used in the initialisation are one-to-one. However, the combination of these components is not one-to-one.