A tool for whistleblowers to identify digital fingerprinting in text documents.
In an attempt to identify information leaks, employers are inserting zero-width (hidden) characters into documents. Each employee receives what appears to be the same document, but each contains a unique digital fingerprint. If the document is leaked, the employer can trace it back to the person who was given that unique version.
Download the files to a storage device, and plug it into the target computer. Open
openme.html in a web browser (e.g. right-click, then choose "open with ... "). Open a document, copy its contents, and paste it into the tool. Hidden characters will appear in red.
Visit https://umpox.github.io/zero-width-detection/ to see zero-width text in action.
Thanks to Devin Hollister-Graham for contributing to the detector code.