A Secure Opus Pulse Steganographic Scheme Based on Message Transform

This paper proposes a secure steganography scheme in Opus pulse domain. Opus is a versatile audio codec designed for interactive Internet applications and is widely used in the Internet communication applications. In Opus pulse domain, there exists a large embedding space, which makes it an ideal carrier for steganography. The challenge is that the generation of pulse samples depends on the value of previous pulse samples, so the embedding operation must be carried out at a single sample, otherwise it will lead to distortion drift. This paper proposes a scheme with message transform and rate-distortion evaluation to improve statistical security. The experiment results show that the proposed scheme achieves good auditory quality and statistical security with a large embedding capacity.