SLRA:安全且支持访问控制的法律智能范围查询方案OA

With the explosive growth of legal data in the cloud computing environment,more and more law firms tend to outsource legal data to cloud servers to reduce computing and storage costs,which inevitably brings security issues.At the same time,most existing range query schemes lack effective access control policies and formal security analysis.Therefore,a secure legal intelligent range query scheme with access control,SLRA,is proposed.First,this scheme adopts an improved asymmetric scalar product preserving encryption(ASPE)algorithm to overcome the shortcoming of the original algorithm being insecure under known plaintext attacks.Second,it uses Geohash algorithm to construct a new index structure,greatly reducing computing and storage overhead and optimizing range query efficiency.Third,it introduces a polynomial-based access control policy to effectively refine the search permissions of the parties.Formal security analysis shows that the SLRA scheme has indistinguishability under chosen-plaintext attack(IND-CPA).Compared with existing algorithms,the SLRA scheme has higher search efficiency and richer functions.