  This work addresses the issues related to network steganography in IEEE
802.15.4 Wireless Personal Area Networks (WPAN). The proposed communication
scheme employs illicit Direct Sequence Spread Spectrum code sequences for the
transmission of steganographic data. The presented approach is a compromise
between minimising the probability of covert channel disclosure and providing
robustness against random errors and a high steganographic data rate. The
conducted analyses show that it is possible to create a covert channel with a
data rate comparable to the raw data rate of IEEE 802.15.4 without much impact
on the perceived receiver sensitivity, the Chip Error Rate and the Bit Error
Rate.
