Abstract
In the course of the evaluation of the stream cipher SOBER-t32 submitted to NESSIE, a correlation between initial states has been found for related keys. With high probability some sums of bits of the initial state after key loading do not change their value when a bit of the key is inverted. This holds also for the loading of frame keys. It is shown that the required condition for the frame keys is met very naturally when using counters as frame keys. The linearity properties of the SOBER-t32 key loading are caused by non-optimal diffusion of the non-linear filter function of the cipher.
Cite
CITATION STYLE
Dichtl, M., & Schafheutle, M. (2002). Linearity properties of the SOBER-t32 key loading. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 2365, pp. 225–230). Springer Verlag. https://doi.org/10.1007/3-540-45661-9_17
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