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Based on Zhang's short signature scheme without random oracles and k+1-square roots assumption, a new fair contract signing protocol with the off-line semi-Trusted Third Party is given because the disadvantages of existed fair contract signing protocol. The off-line semi-TTP intervenes into the protocol in cases where one party attempts to cheat or simply crashes to make the fair exchange optimistic...
Privacy-Preserving Computational Geometry is a kind of special secure multi-party computation problem. As a special privacy-preserving computational geometry problem, Privacy- Path Determination may be applied in many fields such as military field and commerce field. In this paper, a privacy-preserving line-ellipse position relation determination protocol is developed and based on this protocol, a...
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