Sean Murphy is Professor of Mathematics at Royal Holloway, University of London. He has worked in cryptography for over thirty years and has a particular research interest in symmetric cryptography. His publications include Algebraic Aspects of the Advanced Encryption Standard (2006), co-authored by Carlos Cid and Matt Robshaw. Rachel Player is a Senior lecturer in the Information Security Group at Royal Holloway, University of London. Her research considers post-quantum cryptography, and she is best known for her work in lattice-based cryptanalysis and homomorphic encryption. In 2019 she received The Radiant Award for Advancing Internet Security from the Internet Security Research Group.