Privacy-Preserving Top-k Query Processing Algorithms Using Efficient Secure Protocols over Encrypted Database in Cloud Computing Environment

Recently, studies on secure database outsourcing have been highlighted for the cloud computing environment. A few Top-k query processing algorithms proposed in encrypted database. However, previous can support either security or efficiency. Therefore, we propose a new algorithm using homomorphic cryptosystem, which both and For security, efficient protocols based arithmetic operations. To obtain high level of efficiency, also parallel an random value pool. Through our performance analysis, present about 1.5∼7.1 times better with regard to time, compared existing algorithms.