FIDES: lightweight authenticated cipher with side-channel resistance for constrained hardware

  • Authors:
  • Begül Bilgin;Andrey Bogdanov;Miroslav Knežević;Florian Mendel;Qingju Wang

  • Affiliations:
  • ESAT/COSIC and iMinds, KU Leuven, Belgium,EEMCS-DIES, University of Twente, The Netherlands;Department of Mathematics, Technical University of Denmark, Denmark;NXP Semiconductors, Belgium;IAIK, Graz University of Technology, Austria;ESAT/COSIC and iMinds, KU Leuven, Belgium,Department of Computer Science and Engineering, Shanghai Jiao Tong University, China

  • Venue:
  • CHES'13 Proceedings of the 15th international conference on Cryptographic Hardware and Embedded Systems
  • Year:
  • 2013

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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.