Fourandsix, a software manufacturer, has released FourMatch, its first product designed to authenticate images. FourMatch is an extension for Adobe Photoshop CS5 and above that analyzes JPEG images to determine whether they have been modified from their original capture by a camera or mobile device.
According to Fourandsix, hardware and software products store JPEG images in a variety of ways. The various means of storing the images gives rise to product “signatures.” Once an image has been edited and saved, the signature on the file is changed to match the last software that saved the file, changing the signature from the original capture device or any other downstream software that modified the original photograph. So when a file signature matches a known signature from a camera that captured the photograph, a legal professional can be confident that the image has not been edited.
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