## Cryptology ePrint Archive: Report 2014/350

Distributed Smooth Projective Hashing and its Application to Two-Server PAKE

Franziskus Kiefer and Mark Manulis

Abstract: Smooth projective hash functions have been used as building block for various cryptographic applications, in particular for password-based authentication.

In this work we propose the extended concept of distributed smooth projective hash functions where the computation of the hash value is distributed across $n$ parties and show how to instantiate the underlying approach for languages consisting of Cramer-Shoup ciphertexts.

As an application of distributed smooth projective hashing we build a new framework for the design of two-server password authenticated key exchange protocols, which we believe can help to "explain" the design of earlier two-server password authenticated key exchange protocols.

Category / Keywords: cryptographic protocols / smooth projective hashing, two-server PAKE

Original Publication (with major differences): 12th International Conference on Applied Cryptography and Network Security (ACNS '14)