A Survey on Reversible Data Hiding In Encrypted Images

This paper describes a survey on reversible data hiding in encrypted images. Data hiding is a process to embed useful data into a cover media. Data invisibility is its major requirement. Data hiding can be done in audio, video, image, text, and picture. Here use image for data hiding especially digital images. The data may be any text related to the image such as authentication data or author information. At the recipient side it must be able to extract the hidden data and original image. A data hiding technique satisfying this requirement is known as reversible data hiding. Reversible data hiding is a process to reverse the marked media (image) back to the original cover media (image) after the hidden data are extracted. In cloud storage, a content owner can encrypt an image to preserve his/her privacy, and upload the encrypted data onto the cloud. Reversible data hiding in encrypted image, which can recover the original image without any distortion from the marked image after the hidden data extracted. Now a day’s reversible data hiding in encrypted images is in used due to its excellent property which is original cover image can be recovered with no loss after extraction of the embedded data. Also it protects the original data. This paper describes various methods to hide and retrieve back additional messages in an encrypted image.