A survey of key management for secure group communication
ACM Computing Surveys (CSUR)
Attribute-based encryption for fine-grained access control of encrypted data
Proceedings of the 13th ACM conference on Computer and communications security
Ciphertext-Policy Attribute-Based Encryption
SP '07 Proceedings of the 2007 IEEE Symposium on Security and Privacy
Efficient group key management for multi-privileged groups
Computer Communications
Attribute-based encryption with non-monotonic access structures
Proceedings of the 14th ACM conference on Computer and communications security
Conjunctive Broadcast and Attribute-Based Encryption
Pairing '09 Proceedings of the 3rd International Conference Palo Alto on Pairing-Based Cryptography
Attribute-based broadcast encryption scheme made efficient
AFRICACRYPT'08 Proceedings of the Cryptology in Africa 1st international conference on Progress in cryptology
Revocation Systems with Very Small Private Keys
SP '10 Proceedings of the 2010 IEEE Symposium on Security and Privacy
Proceedings of the 17th ACM conference on Computer and communications security
Proceedings of the tenth annual ACM workshop on Digital rights management
Attribute-Based Access Control with Efficient Revocation in Data Outsourcing Systems
IEEE Transactions on Parallel and Distributed Systems
Distributed hierarchical access control for secure group communications
ICCNMC'05 Proceedings of the Third international conference on Networking and Mobile Computing
Collusion resistant broadcast encryption with short ciphertexts and private keys
CRYPTO'05 Proceedings of the 25th annual international conference on Advances in Cryptology
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In multi-privileged group communications, since users, who can subscribe to different data streams according to their interests, have multiple access privileges, security issues are more difficult to be solved than those in traditional group communications. The common drawback of traditional key management schemes is that they will result in the "one-affect-many" problem, because they use a key graph to manage all the keys in a group, which makes one key being shared by many users. Recently, a key-policy attribute-based encryption (KP-ABE) scheme is proposed to encrypt messages to multiple users efficiently, which has been applied in secure multi-privileged group communications. However, user revocation in KP-ABE is still not resolved when applied to multi-privileged group communications. So, in this paper, by uniquely combining a collusion-resistant broadcast encryption system and a KP-ABE system with a non-monotone access structure, we propose a scalable encryption scheme for multi-privileged group communications (EMGC). Based on the features of different multi-privileged group communication systems, we also propose two constructions for our EMGC scheme. With the two constructions, a system can support a user not only to join/leave a group at will, but also to change his access privilege on demand, and the expenses during rekeying operations are small. Therefore, our scheme, which can accommodate a dynamic group of users, is more applicable to multi-privileged group communications.