Indifferentiability of 3-Round Confusion-Diffusion Networks
Document Type
Conference Article
Publication Title
Lecture Notes in Computer Science Including Subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics
Abstract
Substitution-Permutation Networks (SPNs) are a popular and powerful technique for designing block ciphers. Confusion-Diffusion Networks (CDNs), as formalised by Dodis et al. at Eurocrypt’16, treat unkeyed SPNs as a means of extending the domain of public permutations. Dodis et al. showed that 5-round CDNs are indifferentiable from an ideal permutation, and subsequent works by Da et al. at Indocrypt’21 and Nandi et al. at C2SI’23 have established that 2-round CDNs cannot achieve the weaker notion of sequential indifferentiability even with non-linear diffusion layers. In this paper we show for the first time that 3-round CDNs with linear diffusion layers can achieve indifferentiability from an ideal permutation.
First Page
140
Last Page
161
DOI
10.1007/978-3-031-71073-5_7
Publication Date
1-1-2024
Recommended Citation
Bhaumik, Ritam; Nandi, Mridul; Paul, Sayantan; and Saha, Abishanka, "Indifferentiability of 3-Round Confusion-Diffusion Networks" (2024). Conference Articles. 872.
https://digitalcommons.isical.ac.in/conf-articles/872