Side-Channel Analysis

In this paper, we provide an improved side-channel attack on the pre-image computation of Falcon. Our attack targets the implementation that only protects the floating-point multiplication. We show that protecting floating-point multiplication alone is insufficient to defend Falcon against side-channel attacks.

In this paper, we provide the first masking scheme for floating-point number multiplication and addition to defend against recent side-channel attacks on Falcon’s pre-image vector computation.