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What is Symmetric Encryption and Mass Surveillance about?
This document summarizes research on defending symmetric encryption schemes against mass surveillance via algorithm-substitution attacks (ASAs). It defines security goals for such attacks, presents attacks on common randomized stateless schemes, and proposes deterministic stateful schemes that provably resist ASAs. Specifically: 1) It formalizes the goals of "undetectable subversion" for ASAs, where ciphertexts reveal plaintexts to attackers but appear legitimate to users. 2) It shows that common schemes
- Author
- Aleksandar Holtby
- Language
- EN