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Explore advanced cryptographic concepts in this 20-minute conference talk from the S-Boxes session at FSE 2025, chaired by Aleksei Udovenko. Delve into cutting-edge research and developments in substitution boxes, fundamental components of symmetric cryptography that provide nonlinearity in block ciphers and other cryptographic primitives. Learn from expert presentations covering theoretical foundations, practical implementations, and recent innovations in S-box design and analysis. Access comprehensive supporting materials including research papers and presentation slides through the official FSE 2025 program to deepen your understanding of these critical cryptographic building blocks.