Optical steganography with sign-based keys and video as vessel medium

We propose a compressive steganography technique with double keys based on ghost imaging. Unlike conventional steganography schemes using ghost imaging, the proposed technique could utilize a wide variety of public videos as vessel media of steganography. Furthermore, double keys are introduced in steganography to increase the difficulty of cracking greatly. In demonstration, the reconstructed results are quite sensitive to the variation of vessel medium or keys. Moreover, for image steganography, the typical compression ratio of the proposed technique is measured to be 15.3%. In a word, the proposed technique offers a wide choice of vessel media, large parameter space for steganography keys and fine compression performance, and therefore provides a more flexible, robust and efficient way for information security applications.