Covert Channels

Covert Channels
Renaud Bidou - Radware Frédéric Raynal - MISC Magazine
keywords : covert, take, storage, timing, resource, subliminal, network, bounce, multiplexing, portknocker

Abstract
Information and parley dissimulation is not a new topic. til now applications system numerous and approximately recent techniques make such channels more difficult to detect. This can be a wide-cut thing if covert channels are used to foster privacy or increase security of critical parley. However when applied to security policy bypassing, information leak or compromised system control the knowledge of such techniques arrests mandatory to enkindle detection engine. This article will focus on the fantasy of covert channels, from the genesis of the computer age to actual protocol and applications, providing examples of application and detailing advantages and drawbacks.

Introduction
Covert Channels are not everywhere. However they CAN be everywhere, thus providing answers to several issues raised(a) by the use of encryption : legal restrictions and lack of discretion. In the first case the main concern is the protection of ain privacy. One may want his communication theory not to become public. In the second one the issue is to have communications remain undetected.



If the content of an encrypted mail should not be readable, the communication itself is not stealth. And this piece of information may be valuable, mainly if one knows that two entities tries to protect the privacy of their communication. As most security concepts, covert channels do have a dark side. As they provide a stealth and plug communication channel, they can undoubtedly be used to establish connections that are theoretically prohibited by the security policy. accordingly information leaks become possible as well as asynchronous command channels between the compromised system and its master.

narration and concepts
Lampsons Covert Channels

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