Design And Implementation Of Secure Cloud Storage System Based On Attribute Encryption

With the widespread use of cloud storage in recent years,how to prevent data leakage stored on the cloud platform has become an urgent problem to be solved.In this paper,we propose an attribute-based encryption(ABE)scheme as a data encryption scheme for cloud storage system.Different from the identity-based encryption(IBE)scheme and Public key encryption scheme,the proposed scheme achieves access control by introducing the access structure tree.Based on this characteristic,it can be used to encrypt data in cloud storage platform.By the comparison of KP-ABE and CP-ABE,this paper combines concrete CP-ABE scheme to obtain the advantage of adopting CP-ABE.In the CP-ABE scheme,encryptor only needs to specify which the decryptor satisfies some attributes.Therefore,the encryptor needn't specify the identity of the decryptor.If the attribute set of the decryptor satisfies the access structure tree in the ciphertext,the ciphertext can be decrypted with the private key.Otherwise the decryption fail.In this paper,CP-ABE would be exploited in the secure cloud storage system,based on this reason.Based on bilinear pairings(Java Pairing-Based encryption library Cryptography Library,JPBC)as a tool,this paper implements the CP-ABE scheme and successfully deploys the infrastructure of distributed Hadoop system HDFS to achieve security cloud system storage attribute-based encryption.For the security of the cloud storage system in the MapReduce phase of the problem of data security,we can use the homomorphic encryption scheme to ensure the security of the cloud computing.This paper will combine the use of attribute-based encryption and homomorphic encryption scheme to ensure the security of data.However,due to the low efficiency of the existing encryption scheme,it is difficult to be applied to the massive cloud data encryption.