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Title:
LIZARD - A Lightweight Stream Cipher for Power-constrained Devices
Authors: Matthias Hamann, Matthias Krause, Willi Meier
Abstract:Time-memory-data (TMD) tradeoff attacks limit the security level of many classical stream ciphers (like E_0, A5/1, Trivium, Grain) to \frac{1}{2}n, where n denotes the inner state length of the underlying keystream generator. In this paper, we present LIZARD, a lightweight stream cipher for power-constrained devices like passive RFID tags. Its hardware efficiency results from combining a Grain-like design with the FP(1)-mode, a recently suggested construction principle for the state initialization of stream ciphers, which offers provable \frac{2}{3}n-security against TMD tradeoff attacks aiming at key recovery. LIZARD uses 120-bit keys, 64-bit IVs and has an inner state length of 121 bit. It is supposed to provide 80-bit security against key recovery attacks. LIZARD allows to generate up to 2^{18} keystream bits per key/IV pair, which would be sufficient for many existing communication scenarios like Bluetooth, WLAN or HTTPS.
ePrint: https://eprint.iacr.org/2016/926
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