Blockchain-based fair three-party contract signing protocol for fog computing

摘要

Fog computing is a new computing paradigm that can provide flexible resources and services at the edge of network. It is an extension of cloud computing and usually cooperated with cloud computing. Therefore, end users, fog nodes, and cloud servers can form a three-layer service model in practical application. In this model, they should have an agreement on a service contract,which contains every party's rights and obligations before the beginning of the service.However, due to lack of trust, it will suffer from some fairness problems during signing a service contract.Contract signing protocol allows two or more mutual distrust entities to sign a predefined digital contract in a fair and effective way. In this paper, we propose a fair three-party contract signing protocol based on the primitive of blockchain, which can be applied to the scenario of fog computing. Our proposed construction allows the participants to sign a contract in a fairway without the involvementof an arbitrator.Moreover, the privacy of the contract content can be preserved on the public chain. Finally, we realize the proposed protocol through the private blockchain and provide the experimental simulation that analyzes the efficiency and effectiveness.