Incorporating a secure coprocessor in the database-as-a-service model

In this paper, we suggest an extension to the database-as-a-service (DAS) model that introduces a secure coprocessor (SC) at an untrusted database service provider in order to overcome drawbacks in the plain DAS model. The processor serves as a neutral party between the clients and service providers with the goal of increasing security of outsourced data. Additionally, it supports a much broader range of queries performed and reduces both bandwidth and computational burdens on the client. We expect these improvements to make the DAS model more viable and attractive from a client´s perspective.