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1 Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica

1 2014

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Modified Alternating Step Generators with Non-Linear Scrambler

Wicik R., Rachwalik T., Gliwa R.

Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica

2014

Vol. 14, no. 1

61--74

Pseudorandom generators, which produce keystreams for stream ciphers by the exclusiveor sum of outputs of alternately clocked linear feedback shift registers, are vulnerable to cryptanalysis. In order to increase their resistance to attacks, we introduce a non-linear scrambler at the output of these generators. Non-linear feedback shift register plays the role of the scrambler. In addition, we propose Modified Alternating Step Generator with a non-linear scrambler (MASG1S) built with non-linear feedback shift register and regularly or irregularly clocked linear feedback shift register with non-linear filtering functions.