An Approach to Maintain and Ensure the Consistency of Data in Multi Cloud Storage

The protection of data stored on infrastructure provided by third party organization has been an important role for the service providers to store the data and provide security .Not only providing security is a role of the provider but also recovering from the attack i.e. Recovering from the errors occurred to the data which is a critical part for the provider Method to recover from the errors is done through regenerating the code. The data encryption and decryption of data in order to avoid attacks and minimize the repair traffic is done in the user side only. The integrity of data is maintained through generating the MAC for each part of the code. The MAC is verified when the remote user requires the data. The verification of the MAC will play an important role remotely during a failure recovery. There will be a guaranty the data will be available to the user at all time. In this project the data is encrypted and it passed on to the trustee the trustee will divide the data into equal parts and generate the MAC for each part of the data. Then different parts of data are stored in different set of cloud servers which will be later downloaded by the user, example like in RAID level 6. If there is any attack like modifying the data or deleting a file from cloud server the data will be regenerated from the remaining cloud and single whole file of data is generated by the trustee and it will be available to the user based on the secret key provided by the user.