Low Overhead Broadcast Encryption From Multilinear Maps

Provided by: University of Texas at Austin
Topic: Security
Format: PDF
The authors use multi-linear maps to provide a solution to the long-standing problem of public-key broadcast encryption where all parameters in the system are small. In their constructions, cipher-text 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 their systems are based on an O (log N) way multi-linear map to support a broadcast system for N users. They present three constructions based on different types of multi-linear maps and providing different security guarantees. Their systems naturally give identity-based broadcast systems with short parameters.

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