MOE: Multiplication Operated Encryption with Trojan Resilience
(2021) IACR Transactions on Symmetric Cryptology — n° 1, p. 78-129 (2021)
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- Authors
Bronchain, Olivier 
- Abstract
- In order to lower costs, the fabrication of Integrated Circuits (ICs) is increasingly delegated to offshore contract foundries, making them exposed to mali-cious modifications, known as hardware Trojans. Recent works have demonstrated that a strong form of Trojan-resilience can be obtained from untrusted chips by exploiting secret sharing and Multi-Party Computation (MPC), yet with significant cost overheads. In this paper, we study the possibility of building a symmetric cipher enabling similar guarantees in a more efficient manner. To reach this goal, we exploit a simple round structure mixing a modular multiplication and a multiplication with a binary matrix. Besides being motivated as a new block cipher design for Trojan resilience, our research also exposes the cryptographic properties of the modular multiplication, which is of independent interest.
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Citations
Bronchain, O., Faust, S., Lallemand, V., Leander, G., Perrin, L., & Standaert, F.-X. (2021). MOE: Multiplication Operated Encryption with Trojan Resilience. IACR Transactions on Symmetric Cryptology, 1, 78-129. https://doi.org/10.46586/tosc.v2021.i1.78-129 (Original work published 2021)