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We had a LAN party a long while ago where they used a similar proxy. But instead of turning all images upside down they displayed all images not going via https on the main beamer screen. It was a valuable lesson in how secure your bare http connections where. Until the trolls woke up and we learned about all the kinds of porn that existed.

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Ah, yes. Probably driftnet And you will not need trolls for that.

As the debian description says:

== ...Driftnet is a program which listens to network traffic and picks out images from TCP streams it observes. It is interesting to run it on a host which sees a lot of web traffic. . (Obviously, this is an invasion of privacy of a fairly blatant sort. Also, if you are possessed of Victorian sensibilities, and share an unswitched network with others who are not, you should probably not use it.) ==

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