Symmetric Cryptography 1
RSA Conference 2024 · Track Session
In an era where digital services routinely handle data for millions of users, understanding the security implications of cryptographic primitives in a multi-user context is paramount. This talk by Yusuke Naito from Mitsubishi Electric Corporation Japan delves into the **multi-user security** of Message Authentication Codes (MACs), specifically focusing on **Hash-then-Encrypt (HtE)** and its variant, **HtXE**, within the **ideal cipher model**. The research addresses a critical gap in existing security proofs by introducing new notions for universal hashing that adequately cover block cipher-based hash functions, which are prevalent in real-world MAC constructions.