Xerox copier could be replacing numbers in your documents (2013)

Relevant Talk by David Kriesel at CCC Congress(2015). Available in German and Volunteer live translation to English or with English Subtitles

The talk gives a lot of background about how he discovered the bug, how it works and the reaction by Xerox. It's a must have seen talk for anyone who cares about security.

https://media.ccc.de/v/31c3_-_6558_-_de_-_saal_g_-_201412282...

Original discussion: https://news.ycombinator.com/item?id=6156238

The actual article: http://www.dkriesel.com/en/blog/2013/0802_xerox-workcentres_...