Title: Grain-128a: a new version of Grain-128 with optional authentication

Authors: Martin Ågren; Martin Hell; Thomas Johansson; Willi Meier

Addresses: Department of Electrical and Information Technology, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden ' Department of Electrical and Information Technology, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden ' Department of Electrical and Information Technology, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden ' FHNW Hochschule für Technik, Klosterzelgstr, CH-5210 Windisch, Switzerland

Abstract: A new version of the stream cipher Grain-128 is proposed. The new version, Grain-128a, is strengthened against all known attacks and observations on the original Grain-128, and has built-in support for optional authentication. The changes are modest, keeping the basic structure of Grain-128. This gives a high confidence in Grain-128a and allows for easy updating of existing implementations.

Keywords: Grain-128a; Grain-128; stream cipher; cryptographic primitive; hardware attractive; lightweight; message authentication; MAC; medium access control; security; cryptography.

DOI: 10.1504/IJWMC.2011.044106

International Journal of Wireless and Mobile Computing, 2011 Vol.5 No.1, pp.48 - 59

Available online: 09 Dec 2011 *

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