Title: Analysis and Solutions of Security Attacks in Cloud Storage System

Abstract:
We give an overview of contemporary file storage services through an in-depth examination of a stereotype: Dropbox. Based on our analyse of its client software and transmission protocol, we found Dropbox has been exploited to store copyright-protected material, and it indulges the "online slack space" i.e.fails to prevent hiding files unlimitedly in its storage. We discussed measured that can be employed to improve the security of online storage services, especially Dropbox, such as data possession proofs on clients.