A Study on the File-sharing Strategy Based on Cloud Storage
Wen Long · Jiguang zazhi · 2014
Cloud storage, characterized by high extensibility and low cost, offers users the economical and efficient service of file sharing, and in the meantime brings about a new secure problem, that is, how files in the undependable cloud storage are shared by specific users on precondition that their security and privacy are guaranteed. On the basis of identity-based cryptography, the scheme applies proxy ring signature, dynamic broadcast encryption, and bilinear pairings, which are efficient and safe. Through authorized user list, it can add and remove the sharing user without changing old users' secrete key. The scheme is easy, feasible, traceable, anonymous and unable to fake.