Secure Document Sharing and Access Control on Cloud for Corporate User
Kanchan S. Gajghate, Ravi V. Mante · 2018
Cloud document outsourcing is a very popular trend for small scale companies to maintain their documents online. To share data with intended user, this technique provide better technical management. Providing data confidentially is a challenge against curious cloud service provider. Fine-grained data access control is current research topic in public cloud. In TAFC model, they combined time and attribute factor for cloud storage. In this paper, we embedding time release encryption into ABE (Attribute-based Encryption). We propose new advanced ABE techniques to overcome the drawbacks of CP-ABE & KP-ABE. To make the system attacks free and two factor authentication system in which first factor is traditional user id and password authentication and second factor is mobile based authentication. Further We design an efficient approach for time-sensitive data to give fine-grained access control. In existing system, in CP-ABE technique, the access policy attribute will be stored in secret key. Also if user wants to update or remove attributes, he/she have delete or decrypt existing document and again encrypt it. To overcome this problem we will store the access policy attributes separately in meta-data file. The meta- data file secret key and original document file secret keys are dependent on each other. In our proposed system, to change or update attributes any time without document decryption. When a user is update or remove their attribute. By using our system cipher text size will remain constant.