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A complex linear feedback shift register design for the A5 keystream generator

M. Sharaf, H.A. Mansour, Hala H. Zayed, Malcolm Shore

Open publisher page 8 citations

Abstract

A5 encryption/decryption algorithm depends on the use of linear feedback shift registers (LFSR) in order to generate the key-stream bits. The A5-1 algorithm uses three different LFSRs with a majority function to add non-linearity, while A5-2 uses four LFSRs. In this paper a new multi-configurable LFSR design variant of the A5 algorithm is proposed, in which the inverse taps of the LFSR are used to generate the output key-stream bits. The new LFSR design, called a complex LFSR, techniques can be effectively applied in software or hardware to a communications stream to provide a low cost and high speed encryption capability

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What this paper is about

A5 encryption/decryption algorithm depends on the use of linear feedback shift registers (LFSR) in order to generate the key-stream bits. The A5-1 algorithm uses three different LFSRs with a majority function to add non-linearity, while A5-2 uses four LFSRs. In this paper a new multi-configurable LFSR design variant of the A5 algorithm is proposed, in which the inverse taps of the LFSR are used to generate the output key-stream bits. The new LFSR design, called a complex LFSR, techniques can be effectively applied in software or hardware to a communications stream to provide a low cost and high speed encryption capability

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OpenAlex reports 8 citations for this work. Citation counts describe recorded attention and do not establish research quality.

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Available abstract

A5 encryption/decryption algorithm depends on the use of linear feedback shift registers (LFSR) in order to generate the key-stream bits. The A5-1 algorithm uses three different LFSRs with a majority function to add non-linearity, while A5-2 uses four LFSRs. In this paper a new multi-configurable LFSR design variant of the A5 algorithm is proposed, in which the inverse taps of the LFSR are used to generate the output key-stream bits. The new LFSR design, called a complex LFSR, techniques can be effectively applied in software or hardware to a communications stream to provide a low cost and high speed encryption capability

Key concepts: Linear feedback shift register, Keystream, Shift register, Stream cipher, Computer science, Encryption, Key (lock), Algorithm

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