A new speech signal scrambling method for secure communications: theory, implementation, and security evaluation

Author

Re, Enrico Del ; Fantacci, Romano ; Maffucci, Damiano

Author_Institution

Dept. of Electron. Eng., Firenze Univ., Italy

Volume

7

Issue

4

fYear

1989

fDate

5/1/1989 12:00:00 AM

Firstpage

474

Lastpage

480

Abstract

A two-dimensional signal-scrambling method implemented by digital signal-processing techniques that eliminate the need for frame synchronization without impairing security is presented. Such techniques include short time Fourier analysis and the filter bank concept. The use of special digital finite-impulse-response filters, which make it possible to implement the system algorithm completely via commercial processor software, is discussed. As a result, the system can be configured with very little hardware. Methods for determining available keyspace and selecting keys are also presented.

Keywords

Fourier analysis; computerised signal processing; cryptography; digital filters; speech analysis and processing; cryptography; digital finite-impulse-response filters; digital signal-processing; filter bank; keys; keyspace; processor software; secure communications; security; short time Fourier analysis; speech signal scrambling; Bandwidth; Communication system security; Cryptography; Digital filters; Filter bank; Finite impulse response filter; Frequency synchronization; Hardware; Signal processing; Signal processing algorithms; Software algorithms; Speech analysis; Speech enhancement; Speech processing;

fLanguage

English

Journal_Title

Selected Areas in Communications, IEEE Journal on

Publisher

ieee

ISSN

0733-8716

Type

jour

DOI

10.1109/49.17710

Filename

17710