1. Ahsan, K., Kundur, D.: Practical Data Hiding in TCP/IP. In: Proc. of Workshop on Multimedia Security at ACM Multimedia 2002, Juan-les-Pins, France (2002)
2. Bidou, R., Raynal, F.: Covert channels, http://www.radware.com/WorkArea/downloadasset.aspx?id=3928
3. Cuervo, F., Greene, N., Rayhan, A., Huitema, C., Rosen, B., Segers, J.: Megaco Protocol Version 1.0. IETF, RFC 3015 (2000)
4. Galvin, J., Murphy, S., Crocker, S., Freed, N.: Security Multiparts for MIME: Multipart/Signed and Multipart/Encrypted. IETF, RFC 1847 (1995)
5. Handley, M., Jacobson, V., Perkins, C.: SDP: Session Description Protocol. IETF, RFC 4566 (2006)