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This paper presents an optimistic protocol based on the scheme of public verifiable secret share for distributed fair exchange. A distributed third party is designed to guarantee the fairness of exchange. Comparing to traditional trusted third party, this distributed third party is not fixed but dynamically selected by the players of exchange. This solution can effectively remove the risk of single...
This paper presents an optimistic fair exchange protocol based on public verifiable secret sharing for e-procurement applications in Peer-2-Peer networks. According to the decentralized feature of such a network, a distributed third party is designed to guarantee the fairness of exchange. Comparing to traditional trusted third party, this distributed third party is not fixed but dynamically selected...
Tiered wireless sensor networks (WSNs) have many advantages over traditional WSNs. However they are vulnerable to security attacks, especially those targeting at the storage nodes that bu er and process the data readings from sensors. In this paper, we propose a Secure Data Collection protocol - SDC to support time-based queries in tiered WSNs. With small overhead introduced to data communication,...
Electronic auction is one of the basic businesses in electronic commerce. The protection of bidder anonymity and the prevention of bidder default are the keys in the designing of Secure Electronic Auction Scheme. A fair electronic auction protocol is proposed, which is based on the combination of an efficient group signature scheme relying on the ring signature idea and a public-key cryptosystem of...
A multi-party fair exchange protocol is a cryptographic protocol allowing several parties to exchange electronic items in such a way that everyone gives an item away if and only if it receives an item in return. In this paper, we present a new multi-party fair exchange protocol with an Off-line Semi-Trust Third Party (OSTTP). The new protocol can ensure strong fairness and the OSTTP can't get the...
We present a new e-voting scheme based on ring signature that satisfies three major properties: (1) “Everlasting anonymity” or unconditional voter-indistinguishability: even a computationally unbounded party does not gain any information about individual votes anytime, even after tally or in future. This is the first explicitly unconditional privacy discussion in e-voting schemes. (2) Uniform interface...
For electronic items without generability or revocability, previous optimistic exchange protocols can't guarantee strong fairness. Gradual protocols assume equal computing power. And online-TTP (Third Trusted Party) protocols often suffer from communication bottle-neck. A gradual and optimistic fair exchange protocol is presented in this paper to solve the problem. Secrets are gradually exchanged...
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