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Identity-based broadcast encryption with constant size ciphertexts and private keys. (English) Zbl 1153.94366
Kurosawa, Kaoru (ed.), Advances in cryptology – ASIACRYPT 2007. 13th international conference on the theory and application of cryptology and information security, Kuching, Malaysia, December 2-6, 2007. Proceedings. Berlin: Springer (ISBN 978-3-540-76899-9/pbk). Lecture Notes in Computer Science 4833, 200-215 (2007).
Summary: This paper describes the first identity-based broadcast encryption scheme (IBBE) with constant size ciphertexts and private keys. In our scheme, the public key is of size linear in the maximal size $$m$$ of the set of receivers, which is smaller than the number of possible users (identities) in the system. Compared with a recent broadcast encryption system introduced by Boneh, Gentry and Waters (BGW), our system has comparable properties, but with a better efficiency: the public key is shorter than in BGW. Moreover, the total number of possible users in the system does not have to be fixed in the setup.
For the entire collection see [Zbl 1135.94001].

##### MSC:
 94A60 Cryptography 94A62 Authentication, digital signatures and secret sharing
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