Identity-based cryptosystems and signature schemes
Proceedings of CRYPTO 84 on Advances in cryptology
CRYPTO '93 Proceedings of the 13th annual international cryptology conference on Advances in cryptology
The random oracle methodology, revisited (preliminary version)
STOC '98 Proceedings of the thirtieth annual ACM symposium on Theory of computing
The LSD Broadcast Encryption Scheme
CRYPTO '02 Proceedings of the 22nd Annual International Cryptology Conference on Advances in Cryptology
Identity-based broadcast encryption with constant size ciphertexts and private keys
ASIACRYPT'07 Proceedings of the Advances in Crypotology 13th international conference on Theory and application of cryptology and information security
Collusion resistant broadcast encryption with short ciphertexts and private keys
CRYPTO'05 Proceedings of the 25th annual international conference on Advances in Cryptology
Efficient identity-based encryption without random oracles
EUROCRYPT'05 Proceedings of the 24th annual international conference on Theory and Applications of Cryptographic Techniques
Hierarchical identity based encryption with constant size ciphertext
EUROCRYPT'05 Proceedings of the 24th annual international conference on Theory and Applications of Cryptographic Techniques
Practical identity-based encryption without random oracles
EUROCRYPT'06 Proceedings of the 24th annual international conference on The Theory and Applications of Cryptographic Techniques
Pairing'07 Proceedings of the First international conference on Pairing-Based Cryptography
Cryptanalysis of an identity based broadcast encryption scheme without random oracles
Information Processing Letters
Improved security proofs of Delerablée's identity-based broadcast encryption scheme
ICHIT'11 Proceedings of the 5th international conference on Convergence and hybrid information technology
Fuzzy biometric signcryption scheme with bilinear pairings in the standard model
PAISI'10 Proceedings of the 2010 Pacific Asia conference on Intelligence and Security Informatics
Privacy-preserving identity-based broadcast encryption
Information Fusion
Direct CCA secure identity-based broadcast encryption
NSS'12 Proceedings of the 6th international conference on Network and System Security
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In broadcast encryption schemes, a broadcaster encrypts messages and transmits them to some subset S of users who are listening to a broadcast channel. Any user in S can use his private key to decrypt the broadcast. An identity based cryptosystem is a public key cryptosystem where the public key can be represented as an arbitrary string. In this paper, we propose the first identity based broadcast encryption (IBBE) scheme that is IND-ID-CCA2 secure without random oracles. The public key and ciphertext are constant size, and the private key size is linear in the total number of receivers. To the best of our knowledge, it is the first IBBE scheme that is fully CCA2 secure without random oracles. Moreover, our IBBE scheme is collusion resistant for arbitrarily large collusion of users.