Paradise: A Secure, High-reliable Cloud Storage Backup Model For Disasters

With the development of information technology, data security and stability become a topic of general interest. P2P cloud storage system has become a new direction in the storage field. In this paper, we give a secure, high-reliability P2P cloud storage backup model:Paradise, based on secure, reliable data backup needs under disasters, and then we simply implemented this model and tested it to prove that such an idea is feasible. Application of our model can be positioned as a secure backup system for important private files, or even a disaster recovery system for the files. The requirements of the two most important features: security and reliability in our model is much more than any other model ever. We use P2P technology to distribute block files to the other peer nodes on the Internet, this cost is low, and we make more efficient use of the free storage space on the Internet. When disasters happened, user can get his/her files back on any other computer on the Internet in a simple way. We use ID-PKC for account management, then use Chord protocol to organization the cloud, and use consistent hashing to map the metadata management work of the node to its ServiceNodes. These efforts have successfully removed the the most vulnerable part:central server from the cloud, and greatly enhance the availability of the system. The introduction of RS erasure coding module also allows the further improve of the space utilization, and make it more probable to restore a file from the cloud. What's more important, the dual protection from both ID-PKC and the symmetric encryption make the data more secure, the adversaries are difficult to get all parts of a file, and much more difficult to get to know the plaintext data.In chapter IV of this paper, we described in detail about a simple implementation of our model. The beta version of software has not yet achieved the full functionality of the model, but the important network functions and basic file operations have been implemented already. The software works well under test environment, users can upload and download files freely, the data transfered are all encrypted and encoded, they are difficult to be restored or cracked by the adversaries, and even when some nodes fail in cases, legal users still have a big probability to restore his/her files.Our innovation is that, this is the first time we combine identity-based public key cryptography, symmetric cryptography, erasure codes technology, P2P technology together to form a complete reliable and secure cloud storage backup model for disaster, and meanwhile, we almost completely removed the central server from the cloud, to avoid the risk of system crashes caused by a single point failure, this design is innovative and forward-looking.