Pitch-based steganography for Speex voice codec
AbstractThis paper presents an improved version of a steganographic algorithm for IP telephony called HideF0. It is based on approximating the F0 parameter, which is responsible for conveying information about the pitch of the speech signal. The bits saved due to simplification of the pitch contour are used for the hidden transmission. In our experiments, the proposed method was applied to the narrowband Speex codec working in five different modes, with bitrates between 5,950 bps and 24,600 bps. We showed that HideF0 was able to create hidden channels with steganographic bandwidths of around 200 bps at the expense of a steganographic cost of between 0.5 and 0.7 MOS, depending on the Speex mode. Because of placing the approximation flag in the voice packet header, the improved version of the proposed algorithm yielded a significantly lower decrease in speech quality, when compared with the original version of HideF0. In addition, for low bitrates of the hidden channel (i.e., below ca. 50 bps) it was able to operate without introducing any steganographic cost.
|Journal series||Security and Communication Networks, ISSN 1939-0114 [1939-0122]|
|Publication size in sheets||0.5|
|Keywords in English||Steganography, IP telephony, information hiding, speech coding, pitech, Speex|
|project||The Develpment of Digital Communicatios. Project leader: Siuzdak Jerzy,
, Phone: +48 22 234-7232, start date 27-04-2015, end date 31-12-2016, IT/2015/statut, Completed
|Score|| = 20.0, 27-03-2017, ArticleFromJournal|
= 20.0, 27-03-2017, ArticleFromJournal
|Publication indicators||: 2016 = 1.067 (2) - 2016=1.022 (5)|
|Citation count*||3 (2018-07-14)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.