Dynamical running coding in digital steganography

A novel coding method for digital steganography is described, in which the amount of bit alterations introduced into a cover medium is significantly reduced, leading to less distortion and enhanced security against steganalysis. Unlike other block-based stego-coding approaches, the proposed method works in a running manner. In this way, each secret bit is represented by a series of consecutive cover bits, and flipping of one cover bit can be used to insert several secret bits. Theoretical analysis shows that, by reducing host alterations and inducing less distortion, the running coding has advantages over a previous technique.