Random Oracles are Practical: A Paradigm for Designing Efficient Protocols

Authors: Mihir Bellare and Phillip Rogaway

Reference: Proc. First Annual Conference on Computer and Communications Security, ACM, 1993.

Abstract: We argue that the random oracle model -where all parties have access to a public random oracle- provides a bridge between cryptographic theory and cryptographic practice. In the paradigm we suggest, a practical protocol P is produced by first devising and proving correct a protocol PR for the random oracle model, and then replacing oracle accesses by the computation of an "appropriately chosen" function h. This paradigm yields protocols much more efficient than standard ones while retaining many of the advantages of provable security. We illustrate these gains for problems including encryption, signatures, and zero-knowledge proofs.

Full version available in PostScript or gzipped PostScript or pdf .

Rogaway's home page.