A Fast and Low-Distortion Capacity Adaptive Synchronized Acoustic-to-Acoustic Steganography Scheme

Abstract

Data transmissions in public communications systems are not secure because of the chance of their being intercepted, and tampered with by eavesdroppers. The security of acoustic data is an important issue. Particularly, a real-time acoustic steganography is required in a public broadcasting or mobile communication system. This chapter proposes a new steganography scheme with capacity variability and synchronization for secure transmission of acoustic data. In this scheme, the sender records acoustic digital WAV data, converts it into adapted PCM properties, and divides data stream into size-fixed frames. Then it embeds synchronous secret data into fix-sized cover frames, interleaves and transmits the secret data to generate stego data. The receiver extracts the secret data in real-time. A short execution time ensures synchronization, which in turn ensures scalability of privacy protection in live broadcasts. The embedding capacity is chosen as a key depending on the imperceptibly of the scrambling bits of the cover data. A socket model is used to transmit the stego data. Objective (signal to noise ratio) measurements and subjective evaluations demonstrate the effectiveness of the scheme.