cryptography

We prove the security of KEMTLS in two Tamarin models. One mode is based on the Cremers et al. model of TLS 1.3; the other closely resembles our pen-and-paper proofs. These models allow us to analyse KEMTLS, and its extension KEMTLS-PDK from different angles.

We make KEMTLS more efficient in scenarios where the client already has the server’s long-term public key, for example through caching or because it’s pre-installed.

We present an alternative to TLS 1.3, by authenticating using only Key-Encapsulation Mechanisms. This allows us to get rid of handshake signatures, as post-quantum signature schemes are expensive, both in bytes and computation times.