Cryptology ePrint Archive: Report 2015/424

FIDES: Lightweight Authenticated Cipher with Side-Channel Resistance for Constrained Hardware

Begül Bilgin and Andrey Bogdanov and Miroslav Knežević and Florian Mendel and Qingju Wang

Abstract: In this paper, we present a novel lightweight authenticated cipher optimized for hardware implementations called FIDES. It is an online nonce-based authenticated encryption scheme with authenticated data whose area requirements are as low as 793 GE and 1001 GE for 80-bit and 96-bit security, respectively. This is at least two times smaller than its closest competitors Hummingbird-2 and Grain-128a. While being extremely compact, Fides is both throughput and latency efficient, even in its most serial implementations. This is attained by our novel sponge-like design approach. Moreover, cryptographically optimal 5-bit and 6-bit S-boxes are used as basic nonlinear components while paying a special attention on the simplicity of providing first order side-channel resistance with threshold implementation.

Category / Keywords: secret-key cryptography / lightweight cryptography, authenticated encryption, keyed sponge, glitch-free masking, APN permutation, almost bent permutation

Original Publication (in the same form): IACR-CHES-2013

Date: received 4 May 2015

Contact author: begul bilgin at esat kuleuven be

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Version: 20150505:192306 (All versions of this report)

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