Algorithm Substitution Attacks on Symmetric Encryption Schemes.

Since the Snowden revelations, there has been an increased recognition that the threat of mass surveillance targeting regular users' communication is a realistic concern. This project examines how symmetric encryption schemes can be subverted to undermine users' confidentiality while evading detection, continuing a line of enquiry that was re-initiated by Bellare, Paterson and Rogaway in 2013. The project looks at the definitions and assumptions used in the current literature and aims to relate that analysis to the way that encryption schemes are commonly used in internet protocols at present.