Paper 2004/109

Concealing Complex Policies with Hidden Credentials

Robert Bradshaw and Jason Holt and Kent Seamons

Abstract

Hidden credentials are useful in protecting sensitive resource requests, resources, policies and credentials. We propose a significant improvement in decryption performance when implementing hidden credentials using the Franklin/Boneh IBE. We also propose a substantially improved secret splitting scheme for enforcing complex policies, and show how it improves concealment of policies from nonsatisfying recipients.