CRYPTO '93 Proceedings of the 13th annual international cryptology conference on Advances in cryptology
Secure group communications using key graphs
IEEE/ACM Transactions on Networking (TON)
Key Agreement in Dynamic Peer Groups
IEEE Transactions on Parallel and Distributed Systems
Provably authenticated group Diffie-Hellman key exchange
CCS '01 Proceedings of the 8th ACM conference on Computer and Communications Security
The LSD Broadcast Encryption Scheme
CRYPTO '02 Proceedings of the 22nd Annual International Cryptology Conference on Advances in Cryptology
Secure Integration of Asymmetric and Symmetric Encryption Schemes
CRYPTO '99 Proceedings of the 19th Annual International Cryptology Conference on Advances in Cryptology
Dynamic Group Diffie-Hellman Key Exchange under Standard Assumptions
EUROCRYPT '02 Proceedings of the International Conference on the Theory and Applications of Cryptographic Techniques: Advances in Cryptology
Round-Efficient Conference Key Agreement Protocols with Provable Security
ASIACRYPT '00 Proceedings of the 6th International Conference on the Theory and Application of Cryptology and Information Security: Advances in Cryptology
Provably Authenticated Group Diffie-Hellman Key Exchange - The Dynamic Case
ASIACRYPT '01 Proceedings of the 7th International Conference on the Theory and Application of Cryptology and Information Security: Advances in Cryptology
Efficient Trace and Revoke Schemes
FC '00 Proceedings of the 4th International Conference on Financial Cryptography
Round-Optimal Contributory Conference Key Agreement
PKC '03 Proceedings of the 6th International Workshop on Theory and Practice in Public Key Cryptography: Public Key Cryptography
Key Establishment in Large Dynamic Groups Using One-Way Function Trees
IEEE Transactions on Software Engineering
Tree-based group key agreement
ACM Transactions on Information and System Security (TISSEC)
A One Round Protocol for Tripartite Diffie–Hellman
Journal of Cryptology
A fully collusion resistant broadcast, trace, and revoke system
Proceedings of the 13th ACM conference on Computer and communications security
JET: dynamic join-exit-tree amortization and scheduling for contributory key management
IEEE/ACM Transactions on Networking (TON)
Asymmetric Group Key Agreement
EUROCRYPT '09 Proceedings of the 28th Annual International Conference on Advances in Cryptology: the Theory and Applications of Cryptographic Techniques
Adaptive Security in Broadcast Encryption Systems (with Short Ciphertexts)
EUROCRYPT '09 Proceedings of the 28th Annual International Conference on Advances in Cryptology: the Theory and Applications of Cryptographic Techniques
Aggregate and verifiably encrypted signatures from bilinear maps
EUROCRYPT'03 Proceedings of the 22nd international conference on Theory and applications of cryptographic techniques
Generic one round group key exchange in the standard model
ICISC'09 Proceedings of the 12th international conference on Information security and cryptology
Collusion resistant broadcast encryption with short ciphertexts and private keys
CRYPTO'05 Proceedings of the 25th annual international conference on Advances in Cryptology
Hierarchical identity based encryption with constant size ciphertext
EUROCRYPT'05 Proceedings of the 24th annual international conference on Theory and Applications of Cryptographic Techniques
Flexible group key exchange with on-demand computation of subgroup keys
AFRICACRYPT'10 Proceedings of the Third international conference on Cryptology in Africa
Fully collusion resistant traitor tracing with short ciphertexts and private keys
EUROCRYPT'06 Proceedings of the 24th annual international conference on The Theory and Applications of Cryptographic Techniques
Skipping, Cascade, and Combined Chain Schemes for Broadcast Encryption
IEEE Transactions on Information Theory
Provably secure threshold public-key encryption with adaptive security and short ciphertexts
Information Sciences: an International Journal
Decentralized dynamic broadcast encryption
SCN'12 Proceedings of the 8th international conference on Security and Cryptography for Networks
Fast transmission to remote cooperative groups: a new key management paradigm
IEEE/ACM Transactions on Networking (TON)
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Broadcast encryption (BE) schemes allow a sender to securely broadcast to any subset of members but requires a trusted party to distribute decryption keys. Group key agreement (GKA) protocols enable a group of members to negotiate a common encryption key via open networks so that only the members can decrypt the ciphertexts encrypted under the shared encryption key, but a sender cannot exclude any particular member from decrypting the ciphertexts. In this paper, we bridge these two notions with a hybrid primitive referred to as contributory broadcast encryption (CBE). In this new primitive, a group of members negotiate a common public encryption key while each member holds a decryption key. A sender seeing the public group encryption key can limit the decryption to a subset of members of his choice. Following this model, we propose a CBE scheme with short ciphertexts. The scheme is proven to be fully collusion-resistant under the decision n-Bilinear Diffie-Hellman Exponentiation (BDHE) assumption in the standard model. We also illustrate a variant in which the communication and computation complexity is sub-linear with the group size. Of independent interest, we present a new BE scheme that is aggregatable. The aggregatability property is shown to be useful to construct advanced protocols.