Review on Safe Reversible Image Data Hiding

To keep the privacy confidential now a day; two techniques are used to encrypt the image the 1st one is that encrypts the image through cryptography algorithms key. The other one involves the concealing algorithm program to keep the pictures confidential. The owner of the picture performs the cryptography key on the original picture and then use the data hider key to further encrypt the image. The owner doesn't recognize the content because the image contains more information. With the help of a cryptography key, the receiver 1st decipher it then use the data hiding key to completely decipher the image and see the result. Cover images are used which helps the data to further decrypt it. The original image is encrypted by the cover image that will cover the original image. It will further decrypt it. Two encryption techniques are used in this system one is cryptography and the other is knowledge concealing. Cryptography is the technique which is used to cypher the image. It encodes the image in this way that it is not easy to recognize. Cowl images are used which combine with the original image by make a cover around it. This will then encrypt by the specific key. Knowledge concealing is a method through which the data is embedded in the image a specific encrypted key is used that will encrypt the knowledge concealing and then it will combine with the cryptography and make it more secure. Two different keys are used differently in these two methods that more secure the data.