Oblivious S-functions and Their Security against Rotational Cryptanalysis

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DOI:

https://doi.org/10.20535/tacs.2664-29132025.3.345545

Abstract

This paper considers a specific class of ARX primitives: oblivious S-functions, which are distinguished by their computational states being independent of each other. We present generic analytical expressions for the rotation probabilities of oblivious S-functions, which characterize security against rotational cryptanalysis. We also examile particular classes of oblivious S-functions, including generalized NORX-like mappings and LRX-analogues for multiplication by three. For these mappings, we provide numerical values of the rotation probabilities.

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Published

2025-12-28

Issue

Vol. 7 No. 3 (2025): Theoretical and Applied Cybersecurity

Section

Theoretical and cryptographic problems of cybersecurity

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