State convergence in the initialisation of the Sfinks stream cipher
Ali Alhamdan, Harry Bartlett, Leonie Ruth Simpson, Ed Dawson, Kenneth Koon‐Ho Wong · QUT ePrints (Queensland University of Technology) · 2012
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.