Adaptive ternary timing covert channel inIEEE802.11

Covert Channel Elimination Protocols

With the increasing growth of electronic communications, it is becoming important to provide a mechanism for enforcing various security policies on network communications. This paper discusses our implementation of several previously proposed protocols that enforce the Bell LaPadula security model. We also introduce a new protocol called \Quantized Pump" that ooers several advantages, and prese...

Covert Channel Synthesis for Transducers

Covert channels are a security threat for information systems, since they permit illegal flows, and sometimes leaks, of classified data. Although numerous descriptions have been given at a concrete level, relatively little work has been carried out at a more abstract level, outside probabilistic models. In this paper, we propose a definition of covert channels based on encoding and decoding bin...

Information Theory of Covert Timing Channels

We review our recent work on the reliability function of the timing channel associated to the first in first out exponential-server queue. This result may be of use in understanding the limits to communication over covert timing channels arising in networks.

IP Covert Timing Channels: Design and Detection

Stealthier Inter-packet Timing Covert Channels

Covert channels aim to hide the existence of communication. Recently proposed packet-timing channels encode covert data in inter-packet times, based on models of inter-packet times of normal traffic. These channels are detectable if normal inter-packet times are not independent identically-distributed, which we demonstrate is the case for several network applications. We show that ~80% of chann...