Maintaining user privacy and preserving data integrity via Encryption and decryption technique. Using a trust-overlay network over multiple data centers to implement a reputation system for establishing trust between Sender and receiver is becoming mandatory .Cryptographic techniques protect shared data objects and ensure the security level data transfer process. These techniques safeguard multi-way authentications and strengthen the security for accessing confidential data in both public and privation However the problem there is no guarantee that only the legitimate user is accessing the confidential data and maintaining privacy till the user quits the secured communication. Hence to overcome the problem the Data coloring and software watermarking techniques is established to provide the authenticity that is legitimate user only sent the data. The most common email encryption is called PKI. In order to open the encrypted file an exchange of keys is done.
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