The trac quality challenges presented by the cellular net-
work have forced us to use the TCP protocol only, since UDP
trac often does not make it through the network. We are
also forced to use multiple delays to represent a single input
symbol due to the dierences in transmitted and observed
delays. This results in a low bandwidth covert channel. We
are currently working on improved synchronization mecha-
nisms and the implementation of error correcting algorithms
in our timing-based channel to attempt to improve the band-
width of the covert channel.