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Secure Separable Reversible Data Hiding in Encrypted JPEG Bitstreams

There are various methods to exchange secret data from source to destination. Data stowing away be the strategy to insert data into secured media like picture. At the point when a remote server gets the encoded bit stream, the information hider go through the bit stream and embeds extra messages in it utilizing an inserting key by safeguarding the bit stream estimate as original. On the beneficiary side, the extra messages can likewise be removed from the received bit stream if the inserting key is accessible. A beneficiary with just the encryption key can see an estimated picture by an immediate decryption. On the of chance that both the encryption and inserting keys are accessible, the beneficiary can losslessly recuperate the original bit stream followed by the decoding of the marked encoded JPEG bit stream. By these techniques the mystery information security could be upgraded and besides the genuine picture and in addition the concealed information could be almost recovered with out any loss. RC4 is a standout among the most generally used stream cipher for picture encryption due to its straightforwardness, speed and efficiency. The flaws in RC4 are putting forth an open challenge for designers, prompts factual shortcoming in generated key stream for it could be retrieved through a simple brute force attack. Even though RC4 is simple, it took more time for execution. To gain a reduction in the execution time and to enhance security, substituting RC4[6] with ChaCha Algorithm with 8, 12 and 20 rounds. Key sharing concept could be enforced through multiple level of encryption asymmetrically by embedding the encoded encryption and inserting key in the reserved application header segments of the image. Moreover the work shall be conducted to update the comparison of the stated algorithms over a group of images and find out the execution in an empirical way.