![]() Read more in my article on the Naked Security website.įound this article interesting? Follow Graham Cluley on Twitter or Mastodon to read more of the exclusive content we post. Unless you replace your original document, you should still have access to it. You should always save a copy of your document when you redact it, and Acrobat actually helps you with that by using a different file name ('xxxxRedacted.pdf'). When a 22 page PDF document called “Air Defence And Air Traffic Systems Radar Transportation Study – Part 2” was published on a parliamentary website, it was hoped that its more sensitive contents would be properly redacted. The information you removed is gone for good. ![]() The act of obscuring the sensitive information is known as “redaction”, and it needs to be done properly if you want to keep something secret.įor instance, simply putting black text on a black background does not stop people from cutting-and-pasting the contents. The findings, from researchers Maxwell Bland, Anushya Iyer, and Kirill Levchenko, say two of the most popular tools for redacting documents offer no protection to the underlying text at all. While you can black out text as a form of text redaction, it is not technically the same thing. Matt Burgess Security 7:00 AM Redacted Documents Are Not as Secure as You Think Popular redaction tools don’t always work as promised, and new attacks can reveal hidden. Choose the 'Add redaction marks', then select the content that you want to redact. ![]() The UK Ministry of Defence has been caught out again by a schoolboy error – not knowing how to properly redact a PDF.Īs Naked Security has explained before, if you’re an organisation that is making public an internal document, you best make sure that you have deleted or blacked out any personal, confidential or actionable information. Click the 'Choose File' button to upload the target PDF file.
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