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Enhancement in Feedback Polynomials of LFSR used in A5/1 Stream Cipher

by Rosepreet Kaur, Nikesh Baja
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International Journal of Computer Applications
Foundation of Computer Science (FCS), NY, USA
Volume 57 - Number 19
Year of Publication: 2012
Authors: Rosepreet Kaur, Nikesh Baja
10.5120/9224-3783

Rosepreet Kaur, Nikesh Baja . Enhancement in Feedback Polynomials of LFSR used in A5/1 Stream Cipher. International Journal of Computer Applications. 57, 19 ( November 2012), 32-35. DOI=10.5120/9224-3783

@article{ 10.5120/9224-3783,
author = { Rosepreet Kaur, Nikesh Baja },
title = { Enhancement in Feedback Polynomials of LFSR used in A5/1 Stream Cipher },
journal = { International Journal of Computer Applications },
issue_date = { November 2012 },
volume = { 57 },
number = { 19 },
month = { November },
year = { 2012 },
issn = { 0975-8887 },
pages = { 32-35 },
numpages = {9},
url = { https://ijcaonline.org/archives/volume57/number19/9224-3783/ },
doi = { 10.5120/9224-3783 },
publisher = {Foundation of Computer Science (FCS), NY, USA},
address = {New York, USA}
}
%0 Journal Article
%1 2024-02-06T21:00:55.487202+05:30
%A Rosepreet Kaur
%A Nikesh Baja
%T Enhancement in Feedback Polynomials of LFSR used in A5/1 Stream Cipher
%J International Journal of Computer Applications
%@ 0975-8887
%V 57
%N 19
%P 32-35
%D 2012
%I Foundation of Computer Science (FCS), NY, USA
Abstract

There is encryption algorithms used in GSM. This is for to encrypt the information when transmit from mobile station to base station during communication. As stated that A5/1 is strong algorithm but it cryptanalysis by cryptanalysts. This paper modified concept to improve A5/1 encryption algorithm by consideration of feedback combining function of LFSRs (Linear feedback shift register) use in A5/1 and modified version of A5/1 is fast and easy to implement. This is proved by the comparison of existing A5/1 and modified A5/1 with novel key stream generator using pseudorandom binary sequence. Basic security of A5/1 analysis by statistical tests given by national institute of standards and technology (NIST) in order to ensure the quality of bit stream produced by the generator.

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Index Terms

Computer Science
Information Sciences

Keywords

GSM Encryption A5/1 stream cipher Clock Controlling Unit Correlation Statistical testing NLFSR (non-linear feedback function)

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