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David Kriesel: Lies, damned lies and scans

Free and Open Source Software Conference (FrOSCon) e.V. · talk · Watch on YouTube

Information theory & signal processingSoftware (other)Security & hacking

What it is

David Kriesel's FrOSCon talk on how Xerox scancopiers, due to JBIG2 compression, silently replaced digits in scanned documents. He walks through how he discovered the bug and why it is so dangerous.

Why Hacker News recommends it

The standard reference whenever HN discusses the Xerox scanner bug or AI and compression that fabricates content.

  • 2 people recommended it
  • 2 different months
  • 0 strong recommendations
  • first 2020, last 2026

What HN commenters said

  1. “There a few videos of David Kriesel explaining the bug for the curious”

    Explains the Xerox scanner compression bug that altered digits in scans.

    bXVsbGVy, 2020-08 · Recommendation · in “PDF: Still unfit for human consumption, 20 years later”

  2. “the CCC had a pretty neat presentation at that time as well”

    A neat CCC presentation about the Xerox document-altering scanner bug.

    lynx23, 2023-06 · Recommendation

Excerpts from Hacker News comments, linked to the originals. Summaries and labels were written by a language model from those comments.

Topics: xerox, jbig2, image compression, data corruption, david kriesel

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