paper 150303163158

Published: 2015-07-09

Implementation of a Steganographic Algorithm in an Internet VoIP Phone

Damian Bachmat,

Damian Bachmat

Military University of Technology, Poland

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Zbigniew Piotrowski

Military University of Technology, Poland

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Proceedings of 2015 Photonics & Electromagnetics Research Symposium, Prague, July 6 - 9，Page(s)718-721

Abstract

The paper describes implementation of the steganographic method based on the least significant bits (LSB) in a program Internet phone VoIP. In the developed program Internet phone VoIP a library PJSIP has been used. Selected technology — LSB is characterized by easiness of implementation and high data rate and perceptual transparency of a signal with embedded steganographic sequence. In case of the LSB method a change in the least significant bits in a datagram takes place after quantizer of an analog-digital converter circuit. This solution enabled simple implementation of the embedding algorithm by modification of a source code of a codec G.711. The way of the method implementation protects data from errors since mechanisms of the error control and correction of the RTP protocol monitored correctness of sent data. One of the advantages of the method is the fact that for determined number of the least significant bits it does not cause an audible speech degradation and therefore, modified speech signal is perceptually transparent for a subscriber at the receiver side. The paper includes results of tests of developed steganographic phone, among others, subjective audible tests based on signal fidelity estimation standard — ITU-R BS 1116-1, tests of minimal, required time of transmission and integrity tests of steganographic sequence.

Citation

Damian Bachmat, and Zbigniew Piotrowski, "Implementation of a Steganographic Algorithm in an Internet VoIP Phone," Proceedings of 2015 Photonics & Electromagnetics Research Symposium, Prague, July 6 - 9，Page(s)718-721

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