An Efficient and Robust Embedded Digital Signature Based Data Sharing Scheme in Cloud Computing

Abstract

                      One of the most promising encryption techniques for secure data sharing in the field of Cloud Computing is Cipher text-Policy Attribute-Based Encryption (CP-ABE).This encryption technique has turned to be an important encryption technology to tackle the challenge of secure data sharing. In this encryption technique, data user’s private keys and cipher texts are associated with a set of attributes. This technique completely encrypts the data and does not have any control over the individual attributes in the data. So, in order to overcome this problem a concept called attribute with weights was introduced, so that it can have control over the individual elements in the data and could be able to hide sensitive information while sharing data with the users. But the problem of   malicious cloud insider still persists. Visualize in the context of an online health records system. Data user can access the health record by satisfying their arbitrary constraints defined by the data owner. Once they get access to the data, the system cannot prohibit or monitor their valid usage of the data. So an Embedded Digital Signature algorithm is proposed. This algorithm can embed the accessing data user’s credentials in  each health record they access which has a stealth effect of catching and prosecute them in case of an unauthorized data breach. Hence, the resulting scheme becomes more secure.