funsec mailing list archives
Re: [privacy] Digital Camera Fingerprints
From: Scott Manley <djsnm () djsnm com>
Date: Mon, 24 Apr 2006 13:58:47 -0700
Amusingly enough, many images contain thumbnails in the EXIF header and on occasion these have revealed details that the publisher never intended - perhaps most famously when a TV presenter for TechTV published images which had revealing thumbnails http://www.g4tv.com/techtvvault/features/45070/Cat_Schwartzs_Photoshop_Fix.html http://www.hutta.com/thumbs/ Marius Gheorghescu wrote:
You are right. However, the header will stay in the image much longer (it does not disappear simply because the image is edited). For example, in Photoshop when you do 'save for web' it removes the EXIF header (and a couple other similar headers) but if you do 'save as' or 'save' it doesn't touch it. Btw, the reason PS removes the EXIF header is to save bandwidth ;) Just for fun: search your 'Temporary Internet Files' folder for *.JPG files containing the word EXIF ;-))). Not all of them contain complete EXIF information, but some do. If you view the file under a hex editor, the information will be visible at the beginning of the file. Alternatively you can view file properties from Explorer (Properties, Summary, Advanced view)-----Original Message----- From: Richard M. Smith [mailto:rms () bsf-llc com] Sent: Monday, April 24, 2006 10:28 AM To: privacy () whitestar linuxbox org Subject: Re: [privacy] Digital Camera Fingerprints My understanding is that most digital cameras include a unique serial number in the EXIF headers of a JPEG file. This header will stay arounduntil aphoto file is editted. EXIF headers also include the make and model number of a camera. Richard -----Original Message----- From: Justin Polazzo [mailto:jpolazzo () thesportsauthority com] Sent: Monday, April 24, 2006 10:54 AM To: privacy () whitestar linuxbox org Subject: [privacy] Digital Camera Fingerprints http://www.boingboing.net/2006/04/22/digital_cameras_have.html Digital cameras have unique "noise" fingerprints? A researcher at SUNY Binghamton reports that he can tell which camera took any given photo by matching the photo's unique "weak noise-like pattern of pixel-to-pixel non-uniformity." Like actual fingerprints, the digital "noise" in original imagesisstochastic in nature - that is, it contains random variables - whichareinevitably created during the manufacturing process of the camera and its sensors. This virtually ensures that the noise imposed on the digital images from any particular camera will be consistent from one image to the next, even while it is distinctly different. In preliminary tests, Fridrich's lab analyzed 2,700 pictures taken by nine digital cameras and with 100 percent accuracy linkedindividualimages with the camera that took them. -------------------------------- I can think of good and bad uses for this technology (as with all),butthe idea of being able to tell who is _taking_ the child pr0n pictures is pretty enticing. -JP _______________________________________________ privacy mailing list privacy () whitestar linuxbox org http://www.whitestar.linuxbox.org/mailman/listinfo/privacy _______________________________________________ privacy mailing list privacy () whitestar linuxbox org http://www.whitestar.linuxbox.org/mailman/listinfo/privacy_______________________________________________ privacy mailing list privacy () whitestar linuxbox org http://www.whitestar.linuxbox.org/mailman/listinfo/privacy
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Current thread:
- [privacy] Digital Camera Fingerprints Justin Polazzo (Apr 24)
- Re: [privacy] Digital Camera Fingerprints Richard M. Smith (Apr 24)
- Re: [privacy] Digital Camera Fingerprints Marius Gheorghescu (Apr 24)
- Re: [privacy] Digital Camera Fingerprints Scott Manley (Apr 24)
- Re: [privacy] Digital Camera Fingerprints Marius Gheorghescu (Apr 24)
- Re: [privacy] Digital Camera Fingerprints Dave Dittrich (Apr 24)
- Re: [privacy] Digital Camera Fingerprints Michal Zalewski (Apr 24)
- <Possible follow-ups>
- Re: [privacy] Digital Camera Fingerprints Fergie (Apr 24)
- Re: [privacy] Digital Camera Fingerprints Justin Polazzo (Apr 24)
- Re: [privacy] Digital Camera Fingerprints Marius Gheorghescu (Apr 24)
- Re: [privacy] Digital Camera Fingerprints Justin Polazzo (Apr 24)
- Re: [privacy] Digital Camera Fingerprints Andrew Blair (Apr 24)
- Re: [privacy] Digital Camera Fingerprints Richard M. Smith (Apr 24)