Cryptology ePrint Archive: Report 2015/241

Espresso: A Stream Cipher for 5G Wireless Communication Systems

Elena Dubrova and Martin Hell

Abstract: The demand for more efficient ciphers is a likely to sharpen with new generation of products and applications. Previous cipher designs typically focused on optimizing only one of the two parameters - hardware size or speed, for a given security level. In this paper, we present a methodology for designing a class of stream ciphers which takes into account both parameters simultaneously. We combine the advantage of the Galois configuration of NLFSRs, short propagation delay, with the advantage of the Fibonacci configuration of NLFSRs, which can be analyzed formally. According to our analysis, the presented stream cipher Espresso is the fastest among the ciphers below 1500 GE, including Grain-128 and Trivium.

Category / Keywords: secret-key cryptography / stream cipher, encryption, FSR, 5G

Date: received 13 Mar 2015

Contact author: dubrova at kth se

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Version: 20150319:072422 (All versions of this report)

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