Published Paper Details:

Data sharing in cloud computing is depriving user�s direct control over the outsourced data, which inevitably raises security concerns and challenges. Extra computation cost and communication overhead have been introduced to the data owner. Normally in Public Key Encryption the data owner downloads and decrypt the requested data, and further re-encrypts it under the target user�s public key which introduces extra computation cost and communication overhead which is a contradiction of the concept cloud computing. Another way is to allow data owners to define access policies so that the sharing data can be encrypted with the attribute-based encryption using the access policies which allows only authenticated users whose attributes matching their policies to decrypt the cipher text. However, here also data owner needs to download, decrypt and re-encrypt the requested data in case data access policies change dynamically and frequently. To overcome these drawbacks Client Centric Proxy Re-Encryption scheme gives a concrete solution for secure data sharing in cloud computing which deprives user�s direct control over the outsourced data. By making cloud server responsible for re-encryption this application reduces communication overhead, extra computational cost which have been introduced to data owners.