Authenticated Encryption in the Face of Protocol and Side Channel Leakage

Martijn Stam, Bristol University, UK

Authenticated encryption schemes in practice have to be robust against adversaries that have access to various types of leakage, for instance decryption leakage on invalid ciphertexts (protocol leakage), or leakage on the underlying primitives (side channel leakage).
We will consider how to augment the notion of nonce-base authenticated encryption to incorporate leakage and what this implies for composition results, now in the face of protocol and side channel leakage. Specifically, we show how a strongly leakage resilient PRF suffices for leakage resilient AE and demonstrate feasibility of these PRFs in the generic group model.
(based on joint work with Guy Barwell, Daniel P. Martin and Elisabeth Oswald)