Abstract

We introduce a new transform on Boolean functions generalizing the Walsh-Hadamard transform. For Boolean functions \(q\) and \(f\), the q-transform of f measures the proximity of \(f\) to the set of functions obtained from \(q\) by change of basis. This has implications for security against certain algebraic attacks. In this paper we derive the expected value and second moment (Parseval’s equation) of the \(q\)-transform, leading to a notion of \(q\)-bentness. We also develop a Poisson Summation Formula, which leads to a proof that the \(q\)-transform is invertible.

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