Boomerang Spectra of Two Classes of Power Functions via Their Differential Spectra

arXiv2201.10905MaRDI QIDQ6389245

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Publication date: 26 January 2022

Abstract: In EUROCRYPT 2018, Cid $et;al.$ introduced a new concept on the cryptographic property of S-boxes to evaluate the subtleties of boomerang-style attacks. This concept was named as boomerang connectivity table (BCT for short) . For a power function, the distribution of BCT can be directly determined by its boomerang spectrum. In this paper, we investigate the boomerang spectra of two classes power functions over even characteristic finite fields via their differential spectra. The boomerang spectrum of the power function $x^{2^{m+1}-1}$ over $mathbb{F}_{2^{2m}}$ is determined, where $2^{m+1}-1$ is a kind of Niho exponent. The boomerang spectrum of the Gold function $G(x)=x^{2^t+1}$ over $mathbb{F}_{2^n}$ is also determined. It is shown that the Gold function has two-valued boomerang spectrum.

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