STOC '87 Proceedings of the nineteenth annual ACM symposium on Theory of computing
Completeness theorems for non-cryptographic fault-tolerant distributed computation
STOC '88 Proceedings of the twentieth annual ACM symposium on Theory of computing
Multiparty unconditionally secure protocols
STOC '88 Proceedings of the twentieth annual ACM symposium on Theory of computing
Verifiable secret sharing and multiparty protocols with honest majority
STOC '89 Proceedings of the twenty-first annual ACM symposium on Theory of computing
Perfectly secure message transmission
Journal of the ACM (JACM)
Trading Correctness for Privacy in Unconditional Multi-Party Computation (Extended Abstract)
CRYPTO '98 Proceedings of the 18th Annual International Cryptology Conference on Advances in Cryptology
Perfectly Secure Message Transmission Revisited
EUROCRYPT '02 Proceedings of the International Conference on the Theory and Applications of Cryptographic Techniques: Advances in Cryptology
General Adversaries in Unconditional Multi-party Computation
ASIACRYPT '99 Proceedings of the International Conference on the Theory and Applications of Cryptology and Information Security: Advances in Cryptology
Possibility and complexity of probabilistic reliable communication in directed networks
Proceedings of the twenty-fifth annual ACM symposium on Principles of distributed computing
Protocols for secure computations
SFCS '82 Proceedings of the 23rd Annual Symposium on Foundations of Computer Science
International Journal of Applied Cryptography
ICITS'11 Proceedings of the 5th international conference on Information theoretic security
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In this paper, we re-visit the problem of unconditionally secure message transmission (USMT) from a sender S to a receiver R, who are part of a distributed synchronous network, modeled as an arbitrary directed graph. Some of the intermediate nodes between S and R can be under the control of an adversary having unbounded computing power. Desmedt and Wang [4] have given the characterization of USMT in directed networks. However, in their model, the underlying network is abstracted as directed node disjoint paths (also called as wires/channels) between S and R, where the intermediate nodes are oblivious, message passing nodes and perform no other computation. In this work, we first show that the characterization of USMT given by Desmedt et.al [4] does not hold good for arbitrary directed networks, where the intermediate nodes can perform some computation, beside acting as message forwarding nodes. We then give the characterization of USMT in arbitrary directed networks, considering the entire network as a whole. As far our knowledge is concerned, this is the first ever characterization of USMT in arbitrary directed networks.