A randomized protocol for signing contracts
Communications of the ACM
Security without identification: transaction systems to make big brother obsolete
Communications of the ACM
Proceedings of CRYPTO 84 on Advances in cryptology
A provably secure oblivious transfer protocol
Proc. of the EUROCRYPT 84 workshop on Advances in cryptology: theory and application of cryptographic techniques
Untraceable off-line cash in wallet with observers
CRYPTO '93 Proceedings of the 13th annual international cryptology conference on Advances in cryptology
Extensibility safety and performance in the SPIN operating system
SOSP '95 Proceedings of the fifteenth ACM symposium on Operating systems principles
Safe kernel extensions without run-time checking
OSDI '96 Proceedings of the second USENIX symposium on Operating systems design and implementation
Electronic commerce with secure intelligent trade agent
ICICS '97 Proceedings of the First International Conference on Information and Communication Security
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In the last years, the exponential growth of computer networks has created an incredibly large offer of products and services in the net. Such a huge amount of information makes it impossible for a single person to analyze all existing offers of a product on the net and decide which of them fits better her requirements. This problem is solved with the intelligent trade agents (ITA), which are programs that have the ability to roam a network, collect business-related data and use them to make decisions to buy goods on their owners' behalf. Known ITA systems do not provide anonymity in transactions, require an on-line trusted third party and implicitly assume that the user trusts the ITA. We present a new scheme for an intelligent untrusted trade agent system allowing anonymous electronic transactions with an off-line trusted third party.