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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.

Estimation of the pseudorandom signal length with the use of the FFT algorithm

Walczak J., Stępień R.

Computer Applications in Electrical Engineering

2012

Vol. 10

41--49

This paper describes effective estimation method for pseudorandom signal length with the use of FFT algorithm. Proposed method was used in order to calculate the length of sequence of DLFSR generators’ output. The construction of DLFSR generators is described in the following paper. As it is shown on the examples the application of proposed method was implemented on PC computer, which was equipped with a soundcard.

On design of high speed tests pattern generators based on ring LFSRs

Hławiczka A., Garbolino T.

Electronics and Telecommunications Quarterly

2008

Vol. 54, No 1

43-51

The paper describes a method of designing ring registers that have short feedback connections and contain cells functioning as D or T flip-flops. The proposed approach enables obtaining a ring register operating with a maximum frequency for a wide range of polynomials for which existing methods are unable to provide optimal results. The paper also contains a number of examples illustrating different techniques of designing ring registers.