A secure audio teleconference system
CRYPTO '88 Proceedings on Advances in cryptology
CCS '93 Proceedings of the 1st ACM conference on Computer and communications security
Refinement and extension of encrypted key exchange
ACM SIGOPS Operating Systems Review
Strong password-only authenticated key exchange
ACM SIGCOMM Computer Communication Review
Secure group communications using key graphs
Proceedings of the ACM SIGCOMM '98 conference on Applications, technologies, architectures, and protocols for computer communication
Simple and fault-tolerant key agreement for dynamic collaborative groups
Proceedings of the 7th ACM conference on Computer and communications security
Key Agreement in Dynamic Peer Groups
IEEE Transactions on Parallel and Distributed Systems
Three-party encrypted key exchange: attacks and a solution
ACM SIGOPS Operating Systems Review
Password-Authenticated Key Exchange between Clients with Different Passwords
ICICS '02 Proceedings of the 4th International Conference on Information and Communications Security
Group Diffie-Hellman Key Exchange Secure against Dictionary Attacks
ASIACRYPT '02 Proceedings of the 8th International Conference on the Theory and Application of Cryptology and Information Security: Advances in Cryptology
Communication-Efficient Group Key Agreement
IFIP/Sec '01 Proceedings of the IFIP TC11 Sixteenth Annual Working Conference on Information Security: Trusted Information: The New Decade Challenge
Open Key Exchange: How to Defeat Dictionary Attacks Without Encrypting Public Keys
Proceedings of the 5th International Workshop on Security Protocols
Extended Password Key Exchange Protocols Immune to Dictionary Attacks
WET-ICE '97 Proceedings of the 6th Workshop on Enabling Technologies on Infrastructure for Collaborative Enterprises
CLIQUES: A New Approach to Group Key Agreement
ICDCS '98 Proceedings of the The 18th International Conference on Distributed Computing Systems
Encrypted Key Exchange: Password-Based Protocols SecureAgainst Dictionary Attacks
SP '92 Proceedings of the 1992 IEEE Symposium on Security and Privacy
ELK, a New Protocol for Efficient Large-Group Key Distribution
SP '01 Proceedings of the 2001 IEEE Symposium on Security and Privacy
Security proofs for an efficient password-based key exchange
Proceedings of the 10th ACM conference on Computer and communications security
Authenticated key exchange secure against dictionary attacks
EUROCRYPT'00 Proceedings of the 19th international conference on Theory and application of cryptographic techniques
Provably secure password-authenticated key exchange using Diffie-Hellman
EUROCRYPT'00 Proceedings of the 19th international conference on Theory and application of cryptographic techniques
A framework for password-based authenticated key exchange
EUROCRYPT'03 Proceedings of the 22nd international conference on Theory and applications of cryptographic techniques
Forward secrecy in password-only key exchange protocols
SCN'02 Proceedings of the 3rd international conference on Security in communication networks
nPAKE+: a hierarchical group password-authenticated key exchange protocol using different passwords
ICICS'07 Proceedings of the 9th international conference on Information and communications security
N-Party encrypted diffie-hellman key exchange using different passwords
ACNS'05 Proceedings of the Third international conference on Applied Cryptography and Network Security
Password-Based group key exchange in a constant number of rounds
PKC'06 Proceedings of the 9th international conference on Theory and Practice of Public-Key Cryptography
Secure password-based authenticated group key agreement for data-sharing peer-to-peer networks
ACNS'06 Proceedings of the 4th international conference on Applied Cryptography and Network Security
Constant-Round password-based group key generation for multi-layer ad-hoc networks
SPC'06 Proceedings of the Third international conference on Security in Pervasive Computing
Key agreement in ad hoc networks
Computer Communications
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Although two-party password-authenticated key exchange (PAKE) protocols have been intensively studied in recent years, group PAKE protocols have received little attention. In this paper, we propose a tree-based group PAKE protocol -- nPAKE+ protocol under the setting where each party shares an independent password with a trusted server. The nPAKE+ protocol is a novel combination of the hierarchical key tree structure and the password-based Diffie-Hellman exchange, and hence it achieves substantial gain in computation efficiency. In particular, the computation cost for each client in our protocol is only O(log n). Additionally, the hierarchical feature of nPAKE+ enables every subgroup to obtain its own subgroup key in the end. We also prove the security of our protocol under the random oracle model and the ideal cipher model.