Abstract:
Data hiding is a technique for carrying data in a suitable carrier for secure communication. Data hiding technique provides authentication and secure communication but there may be a chance of loss of carrier during communication. Data hiding techniques are mainly used for authentication, media registration, copyright protection, etc. But in the field of medicine and military distortion of the original image is not allowed. So, it needs high secure data hiding techniques. To overcome the problem faced during extracting the carrier with distortion was removed by RDH (Reversible Data Hiding) techniques. RDH technique gets the original data after extracting the secret encrypted data. RDH techniques are classified based on implementing method. In this paper we discussed about different techniques based on histogram shifting, compression embedding and different expansion for RDH are discussed.
