Secure Collaboration in Public Cloud Storages

Public cloud storages such as Box, Dropbox, Google Drive or OneDrive provide a great services of file storing, sharing and collaboration. But these services are provided at the cost of storage providers having access to all users data. This is a very serious security issue and is an obstacle which discourages many individuals and businesses from using these services. Many security solutions have been emerged in recent years to allow using the cloud storages in a secure way. However the design of advanced cloud encryption gateway which will secure users data in clouds without compromising their usability and convenience is a hard scientific and technical problem. In this paper we will review the existing solutions and will briefly introduce our own solution called Skycryptor which provides a perfect secrecy for users without compromising other advantages offered by cloud storage providers.