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The paper How to cook a covert channel
[Hakin9 Pdf]
originally released in the hakin9 magazine describes step by step how to implement
a few covert channel concepts over HTTP cookies :
o Control communication channel
o As stealth as possible (don't care about latency or bandwith)
o Backdoor oriented
The paper finally describes a funny second level caching method allowing to use HTTP
proxy servers as intermediaries to build a communication channel thus having
a way to communicate with a third party without having to reach the remote server
for each data packet.
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