PROVIDING Data Security For Unreliable Clouds Using Reliable Encryption

Abstract

Data Security is one of the most Sensible aspects in a cloud computing environment due to the sensitivity and importance of
information stored in the cloud. There is lot of risk about malicious insider and failure of the Cloud Service Provider affect the lot
of companies information. This paper is related to providing data security and privacy. The data owner stores the files with
encrypted form in the cloud, and doesn’t issue decryption keys to authorized users. It doesn’t not allow the user to get the data
without key because data’s (files) are encrypted with the key so it can only open with the key. When the user request for the data
or file, cloud system ask for the key to decrypt the file. Every time in cloud when the user revoked, system generate the key by
issuing command. However, since a cloud computing environment is comprised of many cloud servers, such commands may not
be received and executed by all of the cloud servers due to unreliable network communications. This problem can be solved by
proposing an instant mailing scheme and sending One Time Password on mobile, which enables the cloud servers to
automatically re-encrypt data. The solution is to build a new encryption scheme, by sending instant password to the valid data
user through their mail and One Time Password.