Communications of the ACM
Secure Transactions with Mobile Agents in Hostile Environments
ACISP '00 Proceedings of the 5th Australasian Conference on Information Security and Privacy
Society and Group Oriented Cryptography: A New Concept
CRYPTO '87 A Conference on the Theory and Applications of Cryptographic Techniques on Advances in Cryptology
Threshold DSS Signatures without a Trusted Party
CRYPTO '95 Proceedings of the 15th Annual International Cryptology Conference on Advances in Cryptology
Practical Threshold RSA Signatures without a Trusted Dealer
EUROCRYPT '01 Proceedings of the International Conference on the Theory and Application of Cryptographic Techniques: Advances in Cryptology
Protecting Mobile Agents Against Malicious Hosts
Mobile Agents and Security
Practical threshold signatures
EUROCRYPT'00 Proceedings of the 19th international conference on Theory and application of cryptographic techniques
Adaptive access control in coordination-based mobile agent systems
Software Engineering for Multi-Agent Systems III
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A major problem of mobile agents is their inability to authenticate transactions in a hostile environment. Users will not wish to equip agents with their private signature keys when the agents may execute on untrusted platforms. Undetachable signatures were introduced to solve this problem by allowing users to equip agents with the means to sign signatures for tightly constrained transactions, using information especially derived from the user private signature key. However, the problem remains that a platform can force an agent to commit to a sub-optimal transaction. In parallel with the work on undetachable signatures, much work has been performedon threshold signature schemes, which allow signing power to be distributed across multiple agents, thereby reducing the trust in a single entity. We combine these notions and introduce the concept of an undetachable threshold signature scheme, which enables constrained signing power to be distributed across multiple agents, thus reducing the necessary trust in single agent platforms. We also provide an RSA-based example of such a scheme basedon a combination of Shoup's threshold signature scheme, [1] and Kotzanikolaou et al's undetachable signature scheme, [2].