Abstract
Conventional speech scramblers have three disadvantages, including heavy communication overhead, signal features underexploitation, and low attack resistance. In this study, we propose a scrambling-based speech encryption scheme via compressed sensing (CS). Distinguished from conventional scramblers, the above problems are solved in a unified framework by utilizing the advantages of CS. The presented encryption idea is general and easily applies to speech communication systems. Compared with the state-of-the-art methods, the proposed scheme provides lower residual intelligibility and greater cryptanalytic efforts. Meanwhile, it ensures desirable channel usage and notable resistibility to hostile attack. Extensive experimental results also confirm the effectiveness of the proposed scheme.
Highlights
Encryption, dating back to Before Christ (BC), is essential for information security in modern society [1]
Since the strong connection between residual intelligibility and speech envelope, our goal aims to come up with a new algorithm which is able to utilize the sparsity of speech signal as well as to decrease the residual intelligibility of the compressed data
Experimental results and discussions the performances of the proposed encryption scheme are evaluated from three perspectives: (1) the residual intelligibility of the encrypted signal; (2) the strength of security; (3) resistance to hostile attacks
Summary
Encryption, dating back to BC, is essential for information security in modern society [1]. Information espionages, including illegal surveillance and wiretapping, have emerged due to the wide applications of speech communication in national defense, economy and trade, scientific research, and social affairs. With security an ever more vital requisite of communications systems, speech encryption has attracted substantial acceptance as an effective means of enhancing protection in both military and civilian applications. The first one is content protection through encryption, e.g., speech scrambler [2,3,4,5,6,7,8,9]. Proper decryption of the data requires a key or the so-called scrambling matrix.
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