Survey of Reversible Data Hiding using Chaos and Genetic Algorithm in Encrypted JPEG Bitstream

Reversible data hiding (RDH) is a technique where secret Information is embedded into a cover image in a reverse way. In general RDH spatial-domain images are encrypted. The proposed system encrypts the JPEG bit stream into a properly organized structure. Then it embeds private message into the encrypted bit stream by lightly changing the JPEG stream. Useful bits suitable for data hiding are then identified. This helps to accurately code the encrypted bit stream carrying secret data. To have a perfect data extraction and image recovery, error correction codes are used in encoding the secret message. Encryption and embedding keys are used in encryption and embedding processes. The secret message bits are encoded with RC4 and embedded into the encrypted bit stream by modifying the appended bits. By using the encryption and embedding keys, the receiver can extract the embedded data and perfectly restore the original image. When the embedding key is absent, the original image can be approximately recovered with satisfactory quality without extracting the hidden data.