Cryptograph Index Technology Based on Strategy of Optimal Bucket Partitioning
People always made efforts on pursuing high-efficiency encryption method to adapt to database system during past decades.Although achievements have been made,there still are problems of long responding,expensive cost and low security of cryptograph index after encrypted that are not solved yet.In this paper,the judgment condition of view security,k-Anonymity was employed on the judgment for the security of cryptograph index.Two security of cryptograph index plan of constructing Hash functions and partitioning multi-sensitive attributes into buckets to establish cryptograph index were proposed aiming at the problem of information leaking by constructing cryptograph index.Finally,an optimal buckets partitioning strategy was proposed.The optimal query ratio can be gotten through buckets partitioning and cryptograph index creation under the condition of sub-interval number of buckets partitioning is limited which make the balance between security and efficiency of cryptograph index.