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Where do you go to authenticate Canon photos?

Started Apr 11, 2019 | Questions thread
Entropy512 Veteran Member • Posts: 6,016
Re: Where do you go to authenticate Canon photos?

petrochemist wrote:

File names& basic EXIF info are all easily alterable. If you can extract the shutter activation information it should be possible to use this to confirm the shooting order. This is less likely to have been altered, and is often less obvious in the exif.

Not all cameras store this information in the EXIF several of mine have convoluted button presses to display the information, but others have it hidden in EXIF - there are websites that provide the shutter count if you upload an image. (Works for my DSLRs but not my micro four thirds bodies)

AFAIK general EXIF tools don't display the shutter count.

I sort of recall seeing that certain Nikons had a feature that used digital signatures to verify that an image was "unaltered" compared to what the camera took.

I don't recall which models it was available for (definitely only for upper-end professional units), or if it was even a "standard" feature as opposed to something only sold to law enforcement organizations.

(Googling returned https://imaging.nikon.com/lineup/software/img_auth/spec.htm - which makes it seem to me like this feature is now discontinued in newer cameras?)

I am, however, about 99% certain there are no viable technical solutions for anything in the PowerShot line for ensuring that images weren't altered after capture.

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