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During the last few years, the explosion of Big Data has prompted cloudinfrastructures to provide cloud-based database services as cost effective,efficient and scalable solutions to store and process large volume of data.Hence, NoSQL databases became more and more popular because of their inherentfeatures of better performance and high scalability compared to otherrelational databases. However, with this deployment architecture where theinformation is stored in a public cloud, protection against the sensitive datais still being a major concern. Since the data owner does not have the fullcontrol over his sensitive data in a cloud-based database solution, manyorganizations are reluctant to move forward with Database-as-a-Service (DBaaS)solutions. Some of the recent work addressed this issue by introducingadditional layers to provide encryption mechanisms to encrypt data, however,these approaches are more application specific and they need to be properlyevaluated to ensure whether they can achieve high performance with thescalability when it comes to large volume of data in a cloud-based productionenvironment. This paper proposes a practical system design and implementationto provide Security-as-a-Service for NoSQL databases (SEC-NoSQL) whilesupporting the execution of query over encrypted data with guaranteed level ofsystem performance. Several different models of implementations are proposed,and their performance is evaluated using YCSB benchmark considering largenumber of clients processing simultaneously. Experimental results show that ourdesign fits well on encrypted data while maintaining the high performance andscalability. Moreover, to deploy our solution as a cloud-based service, apractical guide establishing Service Level Agreement (SLA) is also included.

SEC-NoSQL: Towards Implementing High Performance Security-as-a-Service for NoSQL Databases