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| A Novel Stream Cipher for Cryptographic Applications | |||
| Horan,David M. | Cork Institute of Technology | ||
| Guinee,Richard A. | Cork Institute of Technology | ||
| This paper presents a novel keystream generator using pseudorandom binary sequences (PRBS) with irregular clocking that is based on the A5/1 stream cipher which is used to secure GSM conversations. An improvement in security is obtained by introducing dynamic polynomial switching in the Linear Feedback Shift Registers (LFSRs) present in the architecture for pseudo noise sequence generation. A basic security analysis shows that this introduction increases the stream cipher's resistance to cryptanalysis. Statistical tests are applied to the keystream in compliance with the National Institute of Standards and Technology (NIST) and Diehard test suites in order to ensure the quality of bitstream produced by the generator. | |||
| Richard A. Guinee (M’96) received the B.E., M.Eng.Sc., and Ph.D. degrees in electrical engineering from University College Cork, Ireland, in 1975, 1977 and 2003 respectively. From 1975 – 1977 he was a research engineer at the AERE – Culham Laboratory, G.B. – involved in D2O laser detector design. From 1977 to 1981 he was involved in industry in the design of electrical controls and product development and in industrial consultancy in the design of 380V/10kV electrical installation systems. Since 1981 he has been with the Cork Institute of Technology as a lecturer in electronic engineering and digital communications systems. His research interests are in mathematical modelling and simulation of electrical motor drives, statistical information sources and spread spectrum communications systems. | |||