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David Kriesel: Traue keinem Scan, den du nicht selbst gefälscht hast

media.ccc.de · 7.1M views · 2015-01-01 · 1:03:40

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Overview

David Kriesel's 31C3 talk, in German, on the discovery that Xerox scanner-copiers silently replace digits and letters in scanned documents. He explains how the bug stayed unnoticed in the wild for years.

On Hacker News

Called a classic CCC talk, and the Xerox bug is cited as a cautionary tale about trusting scans and digitized archives.

Recommended by 4 HN people across 5 months · HN mentions 2019–2025

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Security & hackingInformation theory & signal processingTesting, debugging & developer tools
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xeroxjbig2document scanningsoftware bugsccc

What people said

masswerk · 2022-12 · Strong recommendation

Epic talk (in German, David Kriesel, "Traue keinem Scan, den du nicht selbst gefälscht hast"): [VIDEO]

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solarkraft · 2021-11 · Strong recommendation

(2013). The whole ordeal lead to a quite legendary presentation by David at CCC (german, no captions, live translation available but pretty bad): [VIDEO] If you speak german and haven’t seen this yet, watch it, this is a classic. His talks are all entertaining and interesting.

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snicksnak · 2020-12 · Strong recommendation

I would also highly recommend "Traue keinem Scan, den du nicht selbst gefälscht hast" [0] but I just noticed that there are no english subtitles available. [0] [VIDEO] (2015)

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Video by media.ccc.de, played through YouTube.

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