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Erschienen in:
2014 | OriginalPaper | Buchkapitel
Low Overhead Broadcast Encryption from Multilinear Maps
verfasst von : Dan Boneh, Brent Waters, Mark Zhandry
Erschienen in: Advances in Cryptology – CRYPTO 2014
Verlag: Springer Berlin Heidelberg
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We use multilinear maps to provide a solution to the long-standing problem of public-key broadcast encryption where all parameters in the system are small. In our constructions, ciphertext overhead, private key size, and public key size are all poly-logarithmic in the total number of users. The systems are fully collusion-resistant against any number of colluders. All our systems are based on an
O
(log
N
)-way multilinear map to support a broadcast system for
N
users. We present three constructions based on different types of multilinear maps and providing different security guarantees. Our systems naturally give identity-based broadcast systems with short parameters.