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Privacy Preserving Searchable Encryption Scheme with Optimized Homomorphic Encryption on NoSQL Databases

The idea of outsourcing storage and processing of private data to a third party is a high-risk decision that makes applications vulnerable to unauthorized access by an external or by malicious insiders (MIs). Security and privacy in the cloud environment are critical concerns for cloud users. This paper proposes a searchable security scheme and a homomorphic encryption scheme to execute aggregate queries over encrypted non-relational databases and a secure proxy server for implementing the security plan and to provide confidentiality and integrity of the data from malicious insiders (MIs).