A Tale of Resilience: On the Practical Security of Masked Software Implementations

Casalino, Lorenzo; Belleville, Nicolas; Couroussé, Damien; Heydemann, Karine

doi:10.1109/access.2023.3298436

Cited by 1 publication

(1 citation statement)

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“…Specifically, we aim to design a data-oriented ISE class which is leakage-focused: the ISE should eliminate leakage stemming from architectural and micro-architectural overwriting. This goal can be described as necessary but not sufficient, in the sense that additional forms of leakage may also need to be considered (e.g., non-overwriting forms, such as parallel processing of shares per Casalino et al [CBCH23]).…”

Section: Suppose Mem[gpr[mentioning

confidence: 99%

eLIMInate: a Leakage-focused ISE for Masked Implementation

Cheng,

Page,

Wang

2024

TCHES

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Even given a state-of-the-art masking scheme, masked software implementation of some cryptography functionality can pose significant challenges stemming, e.g., from simultaneous requirements for efficiency and security. In this paper we design an Instruction Set Extension (ISE) to address a specific element of said challenge, namely the elimination of leakage stemming from architectural and microarchitectural overwriting. Conceptually, the ISE allows a leakage-focused behavioural hint to be communicated from software to the micro-architecture: using it informs how computation is realised when applied to masking-specific data, which then offers an opportunity to eliminate associated leakage. We develop prototype, latencyand area-optimised implementations of the ISE design based on the RISC-V Ibex core. Using them, we demonstrate that use of the ISE can close the gap between assumptions about and actual behaviour of a device and thereby deliver an improved security guarantee.

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Section: Suppose Mem[gpr[mentioning

confidence: 99%