disLEXia 3000 blog: EXIF Thumbnail in JPEG images · disLEXia 3000 blog: EXIF Thumbnail in JPEG...
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disLEXia 3000 blog: EXIF Thumbnail in JPEG images
disLEXia 3000 blog
Friday, 17. December 2004
EXIF Thumbnail in JPEG imagesmdornseif, 14:45h
At the Aachen Summerschool applied IT security Steven J. Murdoch
came up with an automatic way to analyze if the thumbnal in a JPEG
file is different from the real image. There was widely discussed
incident featuring a topless thumbnail and we wanted to know how
widespread this problem is. So we crawled the net for images and
used Steven's tools to filter for interesting ones. The tool outputs the
main image (left) besides the thumbnail (right).
90% of the rest are cropped images. Sometimes just boring stuff
has ben cropped, but on other instances interesting details where
removed:
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disLEXia 3000 blog: EXIF Thumbnail in JPEG images
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disLEXia 3000 blog: EXIF Thumbnail in JPEG images
Then there are photoshopped images where the Thumbnail reveals
the base for the modification:
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disLEXia 3000 blog: EXIF Thumbnail in JPEG images
Then there are a lot of Images where the Background has been
removed:
Probably this is the most scary image: There the face has been
obscured but the thumbnail contained the original face:
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disLEXia 3000 blog: EXIF Thumbnail in JPEG images
And finally there seem to be images where there are no similarities
between the main image and the thumbnail:
And with certain images the tool sees differences where no
differences are visible to the human eye:
... comment
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disLEXia 3000 blog: EXIF Thumbnail in JPEG images
mdornseif, Saturday, 12. February 2005, 22:15
You can do some screening yourself at http://sauna.5711.org/~md/
thumbnails/
... link
... comment
Backlinks
37 http://en.wikipedia.org/wiki/Exif
7 http://en.wikipedia.org/wiki/Exchangeable_image_fi...
4 http://www.kriptopolis.org/eliminando-metadatos-en...
2 http://blogs.23.nu
2 http://exploit.blogosfere.it/2007/07/quando-le-imm...
2 http://seclists.org/fulldisclosure/2005/Feb/0343.h...
2 Search request: exif thumbnail
1 http://cs.wikipedia.org/wiki/Exif
1 http://elligre.tk/madelman/index.php/archivos/2005...
1 http://forum.rrjeta.net/viewtopic.php?=&p=1048
1 http://hu.wikipedia.org/wiki/Exif
1 http://seguinfo.blogspot.com/2007/08/eliminando-me...
1 http://www.derkeiler.com/Mailing-Lists/Securiteam/...
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disLEXia 3000 blog: EXIF Thumbnail in JPEG images
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1 http://www.sterni.net/blog/permalink.asp?id=11
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