Published Paper Details:

In cloud computing where a data providers deploy his/her encrypted data to the cloud service providers using an attribute based encryption(ABE), and shares data with the users or client with a specific attribute or credentials. But the ABE does not support the secure deduplication, which leads to critical for eliminating the same data in order to save the storage space and network bandwidth. In this paper we proposed an attribute based storage system with a assured deduplicaton in a hybrid cloud, in this the public cloud manages the storage system, where the private cloud is responsible for duplicate detection. Compare with existing system this system has two advantages. Firstly, rather then sharing the decryption keys, it uses specific access policies to confidentially share data with users. Secondly it access data confidentiality by using standard notation of semantic security, whereas existing system only achieved by using weak security notations, In addition, we put forth a methodology to change a ciphertext over one access policy into ciphertexts of the same plaintext but under other access policies without disclose the underlying plaintext.