Felix von Leitner

German IT security expert

OccupationIT security expert

Knownfordietlibc, blog posts, activism

Felix von Leitner
Felix von Leitner at Chaos Communication Congress 2009
Occupation	IT security expert
Known for	dietlibc, blog posts, activism

Felix von Leitner (* 1973),^[1] nicknamed Fefe, is a German IT security expert living in Berlin. He is the main author of the dietlibc, a C standard library. His personal blog posts have received larger media coverage in Germany.

In 2006, he analysed disadvantages of the planned "Gesundheitskarte" (health card).^[2]

He played a crucial role in distributing videos of a case of abusive policing on the 2009 Freiheit statt Angst ("Freedom instead of fear") demonstration, that in the end led to the obligation of the Berlin police to wear identification badges.^[3]^[4]

In 2011, prior to the publication of Mac OS X Lion, he accused Apple of doing too little for its security.^[5]

Felix von Leitner was a long term member of the Chaos Computer Club Berlin (CCC).^[6]

In June 2025, his business partner and personal friend announced on social media that von Leitner had suffered a stroke and was in the process of recovering.^[7] Prior to the announcement, speculation regarding his whereabouts had circulated within the community surrounding von Leitner’s blog, which had not been updated for a longer-than-usual period.

References

↑ IT-Experte Felix von Leitner im Interview: “Die Drosselung bei Netflix und Co ist sinnloser Aktivismus”. Retrieved 2020-11-26.
↑ Borchers, Detlef (2006-11-25). "Elektronische Gesundheitskarte: "Befreites Dokument" wirft Fragen auf". heise online (in German). Retrieved 2019-05-04.
↑ Stöcker, Christian (2009-09-13). "Demo gegen Überwachung: Faustschlag ins Gesicht". Spiegel Online (in German). Retrieved 2019-05-04.
↑ "Parlament stimmt für Polizei-Namensschilder". www.morgenpost.de (in German). 2010-11-11. Retrieved 2019-05-04.
↑ "Security experts take a close look at Lion". The H Security. 2011-03-01. Retrieved 2019-05-04.
↑ von Leitner, Felix (2016-01-19). "Fefes Blog". blog.fefe.de (in German). Retrieved 2019-05-04.
↑ "Özgür Kesim (@oec@infosec.exchange)". Infosec Exchange. 2025-06-24. Retrieved 2025-07-20.

External links

Wikimedia Commons has media related to Felix von Leitner.

Official website (in English)
Official blog (in German)
alternativlos.org - podcast (in German)

Authority control databases: Artists	MusicBrainz

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