Abstract: Cloud storage becomes more and more popular in large scale Database’s data store recently because it has features as low-cost,high efficiency,easy-to-use.To shift database from local to cloud storage server is still facing many challenges,especially in access control of database.We designed a “Weight Cipertext-Policy Attribute-Based Encryption” (WCPABE) scheme and proposed a database access control policy based on WCPABE under the cloud storage platform.Through introducing the concept of attribute weight,WCPABE can dynamically reflect each property’s important degrees in database and enhance the ability for database access control.We proposed three kinds of access control strategies based on WCPABE,and proposed WCPABE’s database encryption model in cloud storage platform and achieved effective and safe access control for database,enhancing database security and solving users’ private key problem in distribution and management.Experimental results show that WCPABE has feasibility and effectiveness and the database owner has more diversified means of enhancing security of the database under cloud storage platform.

Key words: Database security,Attribute-based encryption,Access control,Cloud storage