(Untitled)

[thedward]

Apparently some folks have figured out how to identify the digital camera that took a particular digital photograph based on some sort of stochastic noise profile generated by analyzing previous photographs taken by the same device

Comments

don't forget

[bug138]

Most digital cameras embed their serial numbers as part of the EXIF metadata.

Non-anonymized EXIF data has already lead to at least one high-profile unveiling of an anonymous source.

For instance, on my own photos: http://flickr.com/photo_exif.gne?id=107751656&context=set-72057594074865845

Re: don't forget

[triple_entendre]

wow, all that's missing is a mood icon, and you'd be set.

Re: don't forget

[thedward]

Many printers also include a "feature" that marks the page "invisibly" with some sort of indentifier unique to the particular device.

I'm not sure what can be done about that other than just not using those printers.

[taral]

Both. In the same tool. :)

[thedward]

This seems the most likely.

[parsenome]

No mention of how much manipulation you have to have before it no longer works. Also, the really high end cameras are individually calibrated to remove the variances they talk about, so they might not be able to catch those at all.

I wonder how long it will take someone to come up with an "add noise" filter. Seems like some random noise would do the trick.

I also wonder how sensitive to temperature and ISO variations this stuff is.

[jher]

Much about that is already written. Its an old astrophotography trick to remove the static "dark noise" from your photos.

http://www.astropix.com/PFA/TOC4.HTM