Broadcast encryption with multiple trust authorities

Authors:
Kent D. Boklan;Alexander W. Dent;Christopher A. Seaman
Affiliations:
Department of Computer Science, Queens College, City University of New York;Royal Holloway, University of London, UK;Department of Mathematics, Graduate Center, City University of New York
Venue:
LATINCRYPT'10 Proceedings of the First international conference on Progress in cryptology: cryptology and information security in Latin America
Year:
2010

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Abstract

In this paper we extend the notion of hierarchical identity-based encryption with wildcards (WIBE) from the domain of a single Trusted Authority (TA) to a setting with multiple, independent Trusted Authorities each with their own WIBE. In this multi-trust-authority WIBE environment, a group of TA's may form coalitions, enabling secure communication across domains. These coalitions can be created in an ad-hoc fashion and membership of one coalition does not give a trust authority any advantage in decrypting a ciphertext for a different coalition. This allows the broadcast of confidential messages to large groups of users within a coalition with a single ciphertext. We provide a full syntax and security model for multi-trust-authority WIBEs, and give a constructions based on the Boneh-Boyen WIBE scheme for both passive and active attackers.