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A Robust Bit Modification Audio Steganography for Covert Communication

Authors:
Kaliappan Gopalan
Jiajun Fu

Keywords: Audio steganography; data embedding; bit modification; perceptual quality measure; noise robustness; stego audio.

Abstract:
Sample bit modification for data embedding on a cover audio signal has been shown as a viable technique for steganography and watermarking. Depending on the sample bit index chosen for carrying the embedded data, there is a tradeoff between viability of the data in the presence of noise, robustness and imperceptibility. Although a high threshold of audio samples can carry data at higher bit indices thereby raising robustness, it can be susceptible to noise even at low levels and, with sample amplitudes changed significantly, embedding becomes conspicuous, both detrimental for covert or secure communication. In this paper, modification of the high threshold sample embedding is shown to increase noise immunity with correct data retrieval at a lower payload, but without sacrificing indiscernibility. Experimental results using a noise-free utterance (from a corpus of read speech) and a noisy utterance (between air traffic controllers and pilots) show zero to low bit error rate of hidden data recovery at added noise levels of 50 decibels of signal-to-noise ratio.

Pages: 7 to 10

Copyright: Copyright (c) IARIA, 2015

Publication date: June 21, 2015

Published in: conference

ISSN: 2308-4030

ISBN: 978-1-61208-411-4

Location: Brussels, Belgium

Dates: from June 21, 2015 to June 26, 2015