id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-009424-0jh0945y	Li, Fufang	Research on covert communication channel based on modulation of common compressed speech codec	2020-04-13		.txt	text/plain	5057	236	49	To explore a more effective way to establish a novel convert communication channel over compressed speech stream, this paper presents a steganography method based on modulation of the excitation pulse positions of the G.723.1 low-bit rate codec and G.729A speech codec as the research scenario. Experimental results show that the proposed steganography algorithm of G.723.1 speech codec with an embedding rate of 3.1% and secret information transfer rate of 166 bits/s results in \ 5.7% degradations in perceptual evaluation of speech quality (PESQ) scores, which indicates a high degree of imperceptibility. As to the proposed steganography algorithm of G.729A speech codec, our method can achieve 400 bite/s secret information communication with 3% embedding rate, while the capacity and the degradation rate of the PESQ score for the carrier speech is less than 7%, indicating that the hidden method studied has good privacy and efficacy.	./cache/cord-009424-0jh0945y.txt	./txt/cord-009424-0jh0945y.txt