Steganografie v IP telefonii

Abstract

This master thesis concerns with steganographic techniques and their application in the field of IP telephony. It encompasses description of individual steganographic methods and technologies which are used within the scope of IP telephony. The next part analyzes and describes anomaly detection methods based on Holt-Winters, Holt-Winters:Brutlag and Naive Bayes. Simultaneously, concerns with embedding of a steganogram into an SIP protocol header, means of its detection with help of the anomaly detection system and the use of SIPp application for generating injected SIP protocol messages. The next part of thesis describes a steganographic method which uses an RTP protocol data flow for the transfer of text-based informations. The achieved results are evaluated afterwards.