SkyDe: a Skype-based Steganographic Method
This addresses the need for covert data transmission in encrypted VoIP systems, but it is incremental as it builds on existing Skype protocols.
The paper tackles the problem of enabling clandestine communication by introducing SkyDe, a steganographic method that reuses Skype encrypted packets with silence, achieving a steganographic bandwidth of up to 2.8 kbps.
This paper introduces SkyDe (Skype Hide), a new steganographic method that utilizes Skype encrypted packets with silence to provide the means for clandestine communication. It is possible to reuse packets that do not carry voice signals for steganographic purposes because Skype does not use any silence suppression mechanism. The method's proof-of-concept implementation and first experimental results are presented. They prove that the method is feasible and offers steganographic bandwidth as high as 2.8 kbps.