Temporary Assumptions for Quantum Multiparty Secure Computations

Details Temporary Assumptions for Quantum Multiparty Secure Computations Temporary Assumptions for Quantum Multiparty Secure Computations

2000-10-31

arxiv.org/abs/quant-ph/0010112v2

Physics

Quantum Physics

11 pages, major revision

Scientific paper

This paper introduces quantum multiparty protocols which allow the use of temporary assumptions. We prove that secure quantum multiparty computations are possible if and only if classical multi party computations work. But these strict assumptions are necessary only during the execution of the protocol and can be loosened after termination of the protocol. We consider two settings: 1. A collusion of players tries to learn the secret inputs of honest players or tries to modify the result of the computation. 2. A collusion of players cheats in the above way or tries to disrupt the protocol, i.e., the collusion tries to abort the computation or leaks information to honest players. We give bounds on the collusions tolerable after a protocol has terminated and we state protocols reaching these bounds.

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