期刊名称：International Journal of Computer Science and Network Security
印刷版ISSN：1738-7906
出版年度：2011
卷号：11
期号：2
页码：223-226
出版社：International Journal of Computer Science and Network Security
摘要：A5/1 is the stream cipher algorithm used in GSM communication in order to provide over the air communication privacy. The objective of this paper is to modify the algorithm of the existing A5/1 stream cipher in order to improve the security of GSM communication. Several statistical tests such as frequency test, serial test, runs test, long runs of ones test, and linear complexity test were used to test the strength of the algorithm. Two proposed modified A5/1 algorithms successfully passed all the basic statistical tests.
关键词：component; stream cipher; keystream generator; linear feedback shift register (LFSR); non-linear feedback shift register (NLFSR); clocking; least significant bit (LSB); cryptanalysis
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