Abstract:Side-channel attacks are a major threat to the security of cryptosystems. Masking is a widely used countermeasure against such attacks, but proving the security of masked algorithms is error-prone without formal verification. In this work, we propose a novel approach to formal verification of noninterference properties of masked algorithms based on probabilistic separation logic. By establishing a connection between noninterference and conditional independence, we show how noninterference can be verified using Lilac, a separation logic for conditional independence. We also provide several proof rules that facilitate the verification of probing security and demonstrate their application to example algorithms.
From: Satoshi Kura [view email]
[v1]
Fri, 22 May 2026 07:34:38 UTC (118 KB)
[v2]
Mon, 25 May 2026 09:31:47 UTC (118 KB)
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