Random encryption of speech signal

Mosa, E.; Messiha, Nagy W.; Zahran, O.

doi:10.1109/icces.2009.5383253

Cited by 2 publications

(1 citation statement)

References 11 publications

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“…Time-Segment Permutation, TSP, Frequency-Domain Scrambling, FDS, and Time-Frequency Scrambling, TFS, are techniques of permutation-based speech scrambling. In the first case, TSP, the speech signal is divided in small blocks (typically 16 to 32 ms) and the permutations are made into the blocks according to a scrambling key, generated usually by a Pseudo-Noise (PN) generator [42], [60], [61]. Although it is a simple technique, it has some disadvantages as a small key-space, not low enough residual intelligibility, and low resistance to cryptanalysis.…”

Section: Motivationmentioning

confidence: 99%

Methods of covert communication of speech signals based on a bio-inspired principle

Ballesteros Larrota

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This work presents two speech hiding methods based on a bio-inspired concept known as the ability of adaptation of speech signals. A cryptographic model uses the adaptation to transform a secret message to a non-sensitive target speech signal, and then, the scrambled speech signal is an intelligible signal. The residual intelligibility is extremely low and it is appropriate to transmit secure speech signals. On the other hand, in a steganographic model, the adapted speech signal is hidden into a host signal by using indirect substitution or direct substitution. In the first case, the scheme is known as Efficient Wavelet Masking (EWM), and in the second case, it is known as improved-EWM (iEWM). While EWM demonstrated to be highly statistical transparent, the second one, iEWM, demonstrated to be highly robust against signal manipulations. Finally, with the purpose to transmit secure speech signals in real-time operation, a hardware-based scheme is proposed Esta tesis presenta dos métodos de comunicación encubierta de señales de voz utilizando un concepto bio-inspirado, conocido como la “habilidad de adaptación de señales de voz”. El modelo de criptografía utiliza la adaptación para transformar un mensaje secreto a una señal de voz no confidencial, obteniendo una señal de voz encriptada legible. Este método es apropiado para transmitir señales de voz seguras porque en la señal encriptada no quedan rastros del mensaje secreto original. En el caso de esteganografía, la señal de voz adaptada se oculta en una señal de voz huésped, utilizando sustitución directa o indirecta. En el primer caso el esquema se denomina EWM y en el segundo caso iEWM. EWM demostró ser altamente transparente, mientras que iEWM demostró ser altamente robusto contra manipulaciones de señal. Finalmente, con el propósito de transmitir señales de voz seguras en tiempo real, se propone un esquema para dispositivos hardware.

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Section: Motivationmentioning

confidence: 99%