Possible Duplicate:
Detecting Steganography in images
Is there any commercial traffic monitoring systems that implements steganalysis and could issue a warning upon suspicious file transfer (i.e. upload of image)?
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Not that I know of, but it doesn't sound very hard to do. There are plenty command-line tools which analyse images for steganography. – Luc Dec 18 '12 at 22:57
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The techniques in the answers on that duplicate show many ways to do this. The fact it is outgoing traffic is mostly irrelevant - you just run everything through a steg scanner. – Rory Alsop Dec 18 '12 at 23:13