How to share a function securely
STOC '94 Proceedings of the twenty-sixth annual ACM symposium on Theory of computing
Applied cryptography (2nd ed.): protocols, algorithms, and source code in C
Applied cryptography (2nd ed.): protocols, algorithms, and source code in C
A method for obtaining digital signatures and public-key cryptosystems
Communications of the ACM
Society and Group Oriented Cryptography: A New Concept
CRYPTO '87 A Conference on the Theory and Applications of Cryptographic Techniques on Advances in Cryptology
Shared Generation of Authenticators and Signatures (Extended Abstract)
CRYPTO '91 Proceedings of the 11th Annual International Cryptology Conference on Advances in Cryptology
CRYPTO '97 Proceedings of the 17th Annual International Cryptology Conference on Advances in Cryptology
A Simplified Approach to Threshold and Proactive RSA
CRYPTO '98 Proceedings of the 18th Annual International Cryptology Conference on Advances in Cryptology
Optimal-resilience proactive public-key cryptosystems
FOCS '97 Proceedings of the 38th Annual Symposium on Foundations of Computer Science
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ICNP '03 Proceedings of the 11th IEEE International Conference on Network Protocols
Admission control in Peer-to-Peer: design and performance evaluation
Proceedings of the 1st ACM workshop on Security of ad hoc and sensor networks
URSA: ubiquitous and robust access control for mobile ad hoc networks
IEEE/ACM Transactions on Networking (TON)
Efficient Node Admission for Short-lived Mobile Ad Hoc Networks
ICNP '05 Proceedings of the 13TH IEEE International Conference on Network Protocols
Improved topology assumptions for threshold cryptography in mobile ad hoc networks
Proceedings of the 3rd ACM workshop on Security of ad hoc and sensor networks
Practical threshold signatures
EUROCRYPT'00 Proceedings of the 19th international conference on Theory and application of cryptographic techniques
Further simplifications in proactive RSA signatures
TCC'05 Proceedings of the Second international conference on Theory of Cryptography
Identity-Based access control for ad hoc groups
ICISC'04 Proceedings of the 7th international conference on Information Security and Cryptology
Cryptographic techniques for mobile ad-hoc networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
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In this paper, we propose a secure, flexible, robust and fully distributed signature service, for ad hoc groups. In order to provide the service, we use a new threshold scheme, that allows to share a secret key among the current group members. The novelty of the scheme is in that it easily and efficiently enables dynamic increase of the threshold, according to the needs of the group, so that the service provides both adaptiveness to the level of threat the ad hoc group is subject to, and availability. We prove the correctness of the protocol and evaluate its efficiency. The changes to the threshold are performed by using a protocol that is efficient in terms of interactions among nodes and per-node required resources, resulting suitable even for resource-constrained settings. Finally, the same proposed scheme allows to detect nodes that attempt to disrupt the service, providing invalid contributions to the distributed signature service.