@inproceedings{CAIA-CP-061204K,
    title = {{Covert Channels in the IP Time To Live Field}},
    author = {Sebastian Zander and Grenville Armitage and Philip Branch},
    month = {4-6 December},
    year = {2006},
    pages = {298-302},
    booktitle = {Australian Telecommunication Networks and Application Conference 2006},
    address = {Melbourne, Australia},
    url = {http://caia.swin.edu.au/pubs/ATNAC06/Branch_3m.pdf}
}