Håvard Molland

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In this paper we present a new and improved correlation attack based on maximum likelihood (ML) decoding. Previously the code rate used for decoding has typically been around r = 1/2 14. Our algorithm has low computational complexity and is able to use code rates around r = 1/2 33. This way we get much more information about the key bits. Furthermore, the(More)
Linear equations have always been powerful tools in cryptanalysis. In this paper, we present a general linear equation in the binary alphabet of minimum weight 3 that holds for all state lengths and all shifts of sequences generated by the T-function proposed by Klimov and Shamir. It is surprising that these linear properties exist, and they indicate that(More)
Svalgaard, and independently Mansurov, discovered a correspondence between the geomagnetic variations at the geomagnetic poles and the sector polarity of the interplanetary magnetic field (IMF). Heppner noted an asymmetry in the magnetospheric electric convection field observed within the polar caps at ionospheric altitudes which is also related to the(More)
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