F-PHE — Password-hardened encryption, threshold, key rotation

F-PHE (Password-hardened encryption, threshold, key rotation) is part of Public-Key Primitives, Key Exchange, Messaging in the UC functionality encyclopedia. Status: a canonical, well-established UC functionality.

A recently introduced category, adjacent to F-MHF — the one recent functionality that touches password hashing. The paper introducing it also reports a flaw in the proof of an earlier threshold construction.

References:

• Abdolmaleki et al. Universally composable password-hardened encryption. Cryptology ePrint Archive, Paper 2025/1647, 2025.