Russian encryption specialist ElcomSoft has discovered flaws in Nikon's systems for ensuring that images have not been tampered with.
The flaw in Nikon's Image Authentication System creates a means to produce forged pictures that would successfully pass validation checks. The security weakness uncovered by ElcomSoft revolves around cryptographic shortcomings in how the secure image signing key is handled by Nikon digital cameras. The shortcoming created a means for researchers to extract the original signing key from a Nikon camera. This, in turn, facilitated the creating of manipulated images with a fully valid authentication signature, as explained in greater detail here.

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