Speech Scrambling Based on Wavelet Transform

3 Speech Scrambling Based on Wavelet Transform

Proposed Realization of modified Scrambling using 2D-DWT Based OFDM Transceivers

Voice communication Protection is possible and may be in the future becomes a preferable to view the problem of security of voice communication in term of the classical producing speech ciphering system. The use of different form of speech scramblers have thus been a common approach to voice security. The main aim of this work is to model and simulation a proposed hybrid structure of speech scr...

Design and Evaluation of Transform – Based Speech Scramblers using different Wavelet Transformations

A Speech scramblers based on permutation of coefficients resulting from different wavelet transforms are designed and evaluated. The proposed systems offer twodimensional scrambling process. The suitability of different wavelet transformations ( Daubechies [ db1, bd3 ], Symmlet [ Sym2, Sym4 ] , and Coiflet [ Coif1, Coif2 ]., each one is tested in different decomposition levels [ level1, level2,...

A New Algorithm for Voice Activity Detection Based on Wavelet Packets (RESEARCH NOTE)

Speech constitutes much of the communicated information; most other perceived audio signals do not carry nearly as much information. Indeed, much of the non-speech signals maybe classified as ‘noise’ in human communication. The process of separating conversational speech and noise is termed voice activity detection (VAD). This paper describes a new approach to VAD which is based on the Wavelet ...

Speech Encryption Using Wavelet Packets

The aim of speech scrambling algorithms is to transform clear speech into an unintelligible signal so that it is difficult to decrypt it in the absence of the key. Most of the existing speech scrambling algorithms tend to retain considerable residual intelligibility in the scrambled speech and are easy to break. Typically, a speech scrambling algorithm involves permutation of speech segments in...

Cipher text only attack on speech time scrambling systems using correction of audio spectrogram

Recently permutation multimedia ciphers were broken in a chosen-plaintext scenario. That attack models a very resourceful adversary which may not always be the case. To show insecurity of these ciphers, we present a cipher-text only attack on speech permutation ciphers. We show inherent redundancies of speech can pave the path for a successful cipher-text only attack. To that end, regularities ...