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Subject:RE: Show what I'm doing, show what you're doing From:"McLauchlan, Kevin" <Kevin -dot- McLauchlan -at- safenet-inc -dot- com> To:Gregory P Sweet <gps03 -at- health -dot- state -dot- ny -dot- us> Date:Sun, 18 Nov 2012 20:56:44 -0500
Nice, succinct explanation. I learned something.
Thanks.
It's similar to what goes on in RD, !m, and other remote desktop apps, but I wasn't sure that was necessarily the model used by those services.
However, I doubt an attacker would need to be in on the connection from the first moment. Full-screen refreshes are not likely a "frequent" occurrence in such a session, but even if they occur only occasionally on the timeframe of internet/web speeds, they're still probably happening several times every minute.
But, on third thought, they must be using link-securing techniques. The transactions wouldn't be sent in-the-clear. So there's still a considerable hurdle even for the most sophisticated and well-heeled bad guys.
From: Gregory P Sweet [mailto:gps03 -at- health -dot- state -dot- ny -dot- us]
Sent: November-16-12 3:12 PM
[snip]
Most of these systems work and achieve the efficiency they do (think broadcast slides to 3000 end points with fraction of second latency) by taking a snapshot of your screen and broadcasting it. Then they constantly take snapshots (like a movie camera) but only transmit the pixels that change, so even if some data did leak out, chances are it would be a useless slice of screen near the mouse. Someone would have to break in and steal the whole stream to get anything useful. In most cases, unless you record the session and store it on the hosts servers or upload documents to the host servers, nothing persists after the session.
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