Generalized Identity Based and Broadcast Encryption Schemes
Authors: D. Boneh and M. Hamburg
Abstract:
We provide a general framework for constructing identity-based and
broadcast encryption systems. In particular, we construct a general
encryption system called spatial encryption from which many
systems with a variety of properties follow. The ciphertext size in
all these systems is independent of the number of users involved
and is just three group elements.
Private key size grows with the complexity of the system. One
application of these results gives the first broadcast HIBE
system with short ciphertexts. Broadcast HIBE solves a natural
problem having to do with identity-based encrypted email.
Reference:
In proceedings of Asiacrypt 2008, LNCS 5350, pp. 455-470