Personal interpretation: it's about physical security (infrastructure hacking), physics (arc vs line trajectories), cooperation and secret signalling (some sort

Personal interpretation: it's about physical security (infrastructure hacking), physics (arc vs line trajectories), cooperation and secret signalling (some sort of steganography), and refusal to submit to unfair centralized authorities. All of which are favorite topics of HN from what i could see so far. EDIT: As for the date, the article was published for Kropotkin's birthday apparently.