Research On Cloud Storage Access Control From Outsourcing-decryption ABE

At present, cloud computing is developing at an unprecedented speed, and people's demand for resource sharing and obtaining in the open environment is becoming larger.Cloud storage brings people great convenience. However, it exposes many problems. The most obvious problem is the security, which is the security issue for the data. The most effective way to solve it is to implement access control for data. Thus, cloud storage access control becomes an important research direction.In this paper, we first study attribute-based encryption(ABE). We focus on the fast decryption and verification for ABE, and achieve the ABE algorithm, and compare to Junzuo et al. Then we study how to solve the security problem of cloud storage data by using ABE,and construct a client that can interact with ALI cloud, and show the practical value.First, this paper introduces the idea of outsourcing, improve the basic ABE algorithm.And our ABE is based on ciphertext-policy(CP). The advantage of this scheme is that the decryption time is short, and the fast decryption of ABE is realized. The method is to do a large number of bilinear operations on the decryption by the third party, and give the result to the user.Secondly, this paper introduces the idea of signature, and constructs a CP-ABE scheme.The proposed scheme not only guarantees the decryption efficiency, but also solves the problem of the verification. The signature scheme is short signature. In addition, this paper shows that the proposed scheme is better than Junzuo's by experiment.Finally, this paper bases on Ali cloud and the proposed scheme, and build a cloud system and client. The client is based on the Java and Windows. It ensures the security of the data, achieve the fine-grained access control. It shows the practical value of ABE scheme.