![]() This is ostensibly an anti-counterfeiting measure, originally used by the US Secret Service to identify the source of fake banknotes, but it’s also pretty handy for tracking down whistleblowers who don’t take proper precautions. ![]() Most color printers add a pattern of yellow dots to any printout, encoding a unique serial number and the date and time that the printout was made. The Field Guide to Security Training in the Newsroomĭid you know that sharing and publishing files can burn your sources?Įxample: Vice and John McAfee: - When Vice published the story, the photos still had location data included and basically burned their source.Įxample: How The Intercept Outed Reality Winner - Reality Winner used traditional mail, not the Internet, to share documents with the Intercept, but was caught due to both operational security mistakes and metadata included in the printed files she shared.Įxample: BBC: Why printers add secret tracking dots - One mistake that Reality Winner made was to use a color printer to print the documents she leaked.
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March 2023
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