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Erschienen in:
2010 | OriginalPaper | Buchkapitel
Broadcast Encryption with Multiple Trust Authorities
verfasst von : Kent D. Boklan, Alexander W. Dent, Christopher A. Seaman
Erschienen in: Progress in Cryptology – LATINCRYPT 2010
Verlag: Springer Berlin Heidelberg
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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.