Decim v2

Come Berbain (1) , Olivier Billet (1) , Anne Canteaut (2) , Nicolas Courtois (3) , Blandine Debraize (4) , Henri Gilbert (1) , Louis Goubin (4) , Aline Gouget (4) , Louis Granboulan (5) , Cédric Lauradoux (2) , Marine Minier (2, 6) , Thomas Pornin (7) , Herve Sibert (8)

1 FT R&D - France Télécom Recherche & Développement
2 CODES - Coding and cryptography
3 UCL - University College of London [London]
4 Gemalto [Meudon]
5 ASTRIUM
6 ARES - Architectures of networks of services
7 Cryptolog - Cryptolog International
8 NXP Semiconductors

In this paper, we present Decimv2, a stream cipher hardware- oriented selected for the phase 3 of the ECRYPT stream cipher project eSTREAM. As required by the initial call for hardware-oriented stream cipher contribution, Decimv2 manages 80-bit secret keys and 64-bit public initialization vectors. The design of Decimv2 combines two filtering mechanisms: a nonlinear Boolean filter over a LFSR, followed by an irregular decimation mechanism called the ABSG. Since designers have been invited to demonstrate flexibility of their design by proposing vari-ants that take 128-bit keys, we also present a 128-bit security version of Decim called Decim-128.

Domaines: Complexité [cs.CC]

Come Berbain, Olivier Billet, Anne Canteaut, Nicolas Courtois, Blandine Debraize, et al.. Decim v2. New Stream Cipher Designs - The eSTREAM finalists, Springer, pp.140-151, 2008, Lecture Notes in Computer Science, ⟨10.1007/978-3-540-68351-3_11⟩. ⟨hal-00328847⟩