Law enforcement agencies often use this to help verify whether a picture has been altered since it was downloaded from the camera. “When you look into the packaging of a jpeg using code – the order in which all the bits of information are ordered are very specific and are very different for Photoshop versus an iPhone versus Panasonic or Nikon,” explains Farid. “So we can look at the packaging of a file and say this has gone through Photoshop because there are these tell-tale signs.”

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