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I'm surprised that scanning IDs is much of a deterrent. If would-be thieves are going to the trouble of booking rooms on AirBNB and the like, they are obviously more than casual criminals, and probably fairly technically adept ones at that. Taking the next logical step to Photoshop the image doesn't seem like much of an obstacle for someone so motivated.

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Indeed, if Nigerian 419 scammers have already picked up photoshopping IDs [1], you can imagine what a low barrier this will be. The real question is if you can verify the ID electronically from the image, and the answer will generally be no.

[1] http://www.419eater.com/html/hall_of_shame4.htm

You might be able to use Hany Farid's work on doctored photographs to show they've been tampered with. See, eg, this interesting transcript of his Nova appearance.

http://www.pbs.org/wgbh/nova/tech/hany-farid.html

Steganography/image manipulation is an arms race but you'll keep the low end fake IDs out. At some point in the race master criminals are going to go for higher value targets than random apartments on AirBnB. And... problem solved.

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