Abstract:

As for the shortcoming that the participants cant carry out secure multiparty protocol, an extended proxy multiparty is proposed. The model has higher security comparing to the related models, it is formally described from functionality, protocol and security. A secure union set protocol is designed under this model, furthermore, the protocols efficiency, security and correctness are discussed.

Key words: secure multiparty computation, proxy multiparty computation, secure outsourcing computation, secure sum protocol