Paper Details

In cloud computing environment there are many users of cloud stores there data and accessing of large datastored on cloud. But these users face some of major issue causing loss of data in cloud and facing a problem in authorityand privacy of users. Cipher text-Policy Attribute based Encryption (CP-ABE) is a promising encryption technique thatenables end-users to encrypt their data under the access policies defined over some attributes of file and upload encryptedfile with encrypted attribute with key provided by attribute authority. Cloud consumers want to download and only allowdata consumers whose attributes satisfy the access policies to decrypt the data. In CP-ABE, the access policy is attached tothe cipher text in plaintext form, which may also leak some private information about end-users. Existing methods onlypartially hide the attribute values in the access policies, while the attribute names are still unprotected, these issues aremodify in our scheme to provide more security. While uploading a file time server is associated with file to provide accessto file for limited time only after that time file is unavailable for consumers. Also attribute bloom filter generate attributes offile while uploading and this attributes are store with file. Attribute authority in our scheme assign public key to user whileuploading files on cloud and also files secret key and private key to data consumer while uploading. After entering keywordconsumer will get top rank result depends upon attribute and time and can download that file if consumer having key of thatfile and can decrypt file.

Vikash Kumar, Ashish Jha, Rohit kumar Pandit, Kunal Roshan, Aditya Kumar, “PRIVACY-PRESERVING AND FINE GRAINED ACCESS SCHEME FOR BIG DATA DEDUPLICATION IN CLOUD”, International Journal of Advance Engineering and Research Development (IJAERD), Vol. 5, Issue 5, pp. 637-642, May 2018.