An audio/video crypto — Adaptive optical steganography technique

In recent years a growing interest in information hiding in multimedia data as the host has been observed in the research community. This hidden information can be used for many different purposes, including source identification, copyright protection and covert data transmission. In this paper, an optical crypto technique with adaptive steganography (AS) is proposed for audio/video sequence encryption and decryption. The optical crypto technique is based on double random phase encoding algorithm to encrypt and decrypt the intended audio/video sequences. The main purpose of steganography algorithms is to hide as much information within the cover media as possible. Therefore, for steganography algorithms, the tradeoff is between the amount of covert information being embedded, called stego-data, and that the ensurance for its presence to remain undetected. While their purposes may seem different, recent advances allow more and more the use of advanced watermarking techniques to embed large amounts of covert information that is also robust against removal and detection.