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Steganography is the classical technique of securing the confidential data. The data is hidden in an object called cover medium. The encoder (sender) and the decoder (receiver) only have the knowledge of secret data hidden in the cover object. An image is a cover object that hides the secret data. DNA is another cover object which has a huge data storage capacity and it hides a very large secret data by replacing the bases which are of huge numbers to a particular DNA. In this study, the various techniques that are applied for hiding a secret message in different cover objects like image and DNA are summarized and the integrity of the secret message in various mediums are discussed. The combination of DNA and Images used together to hide a secret message or data is known as dual cover steganography; here the cover objects are DNA and Image. This work also provides all the existing methods on Image …