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Covert channels threaten conventional network security paradigms by exploiting existing system resources never intended to facilitate communication. By doing so, they can evade detection by conventional network security mechanisms such as firewalls. In order to improve network security, it is necessary to detect and disrupt covert communications. Due to the sheer number and variety of covert channel...
Covert channels are a network security risk growing both in sophistication and utilization, and thus posing an increasing threat. They leverage benign and overt network activities, such as the modulation of packet inter-arrival time, to covertly transmit information without detection by current network security approaches such as firewalls. This makes them a grave security concern. Thus, researching...
IEEE 802.16 is defining standards for mobile multihop relay (MMR). The major purpose of MMR is to efficiently extend the coverage of a BS and to enhance the system throughput. Relay station (RS) has been introduced to fulfill this goal. However, packets in MMR would have a large probability of failure transmission because not all links over the multihop path are in good channel condition. Therefore,...
VoIP is rapidly growing and widely used real-time voice service. On the path through the packet-switched networks, the regularity of VoIP stream is impaired by routing, queuing, scheduling and serialization effects, consequently resulting in loss and delay jitter of packets. Achieving high quality real-time voice requires smoothing the delay jitter at the receiver which is generally done by means...
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