@article{CAIA-JP-071200A,
    title = {{Covert Channels and Countermeasures in Computer Network Protocols}},
    author = {Sebastian Zander and Grenville Armitage and Philip Branch},
    month = {December},
    year = {2007},
    pages = {136-142},
    volume = {45},
    number = {12},
    journal = {IEEE Communications Magazine},
    doi = {10.1109/MCOM.2007.4395378},
    url = {http://dx.doi.org/10.1109/MCOM.2007.4395378}
}