International Technology Alliance Collaboration System (ITACS)
Existing distributed database systems widely assume a central trusted server for query planning. However, in many coalition scenarios such central server is hard to establish and maintain due to lack of trust. In this paper, the authors propose a decentralized query planning service for data sharing in coalition networks. This planning service exploits negotiations among collaborating parties to find a proper way of splitting the planning task to parties, while controlling the risk of information leakage.