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Detecting SSH Tunnels

Italian researchers have published a paper on the Detection of Encrypted Tunnels across Network Boundaries. I came across it in a google search because I’ve been thinking of writing a program which does something similar. It doesn’t seem like anyone else has picked up on this research yet so I thought I should mention it. Here is a link to the actual paper: pdf or scribd.

They claim their technique can differentiate between “normal” ssh or scp sessions and ssh sessions which are being used to tunnel traffic (through ssh’s port forwarding mechanism).

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