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In this paper, the authors evaluate available steganographic techniques for SIP (Session Initiation Protocol) that can be used for creating covert channels during signaling phase of VoIP (Voice over IP) call. Apart from characterizing existing steganographic methods they provide new insights by introducing new techniques. They also estimate amount of data that can be transferred in signalling messages for typical IP telephony call. Steganography is a process of hiding secret data inside other, normally transmitted data. Usually, it means hiding of a secret message within an ordinary message and its extraction at the destination point. In an ideal situation, anyone scanning this information will fail to know whether it contains covert data or not.
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