Popular redaction tools don’t always work as promised, and new attacks can reveal hidden information, researchers say.
you wanted to protect sensitive text in a document, you could grab a pair of scissors or a scalpel and cut out the information. If this didn’t work, a chunky black marker pen would do the job. Now that most documents are digitized, securely redacting their contents has become harder. The majority of redactions—by government officials and courts—involve placing black boxes over text in PDFs.
The flaws aren’t just theoretical. After examining millions of publicly available documents with blacked-out redactions—including from the US court system, the US Office of the Inspector General, and Freedom of Information Act requests—the researchers found thousands of documents that exposed people’s names and other sensitive details.
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