Exif thumbnails and pron crawler
Digital cameras store small image called "thumbnail" inside big image content. Usually this image gets lost in later image processing, but sometimes thumbnail contain sensitive information cropped off from big image.
We know that jpeg images hide some Exif informations, for example a image thumbnail.
Tonu Samuel in a post about exif and privacy on Full Disclosure said:
"..approximately 1% or less jpg images contains any exif thumbnails which in opinion of my software have some difference from big image. I already excluded URLs containing word "thumb" and many other possibly bad matches, so 1% is still overestimated.
Most of this 1% is 90 degrees rotations, small crops and other not-so important changes. Less than 1% of those 1% contain something sensitive. This is question of definition"
And he wrote a crawler for imgas that contains exif data.
..Do you want your gigabyte of Pr0n today?
Automated script downloads JPEG files from web and analyses them for thumbnail and image differences and puts possible candidates in MySQL database. Result are visible on exif crawler page.
The crawler is based on mnoGoSearch and works with this exif patch.
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