[r3s] (en) A brief introduction to Group 3 facsimile signalling (Christian Berger) english transla
▶[r3s] (en) A brief introduction to Group 3 facsimile signalling (Christian Berger) english transla — a Chaos Computer Club (media.ccc.de) security conference talk on network (21:26 min). Watch the full video, indexed free on the Breach Arc Archive.
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