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I think you are being overly optimistic on the "hard to wiretap". Here: https://events.ccc.de/congress/2014/Fahrplan/system/attachments/2559/original/Iridium-

I think you are being overly optimistic on the "hard to wiretap". Here: https://events.ccc.de/congress/2014/Fahrplan/system/attachments/2559/original/Iridium-Talk-Komplett.pdf https://events.ccc.de/congress/2014/Fahrplan/system/attachme... And here: https://events.ccc.de/congress/2015/Fahrplan/system/event_attachments/attachments/000/002/834/original/Iridium-Talk-32c3-final.pdf https://events.ccc.de/congress/2015/Fahrplan/system/event_at... You just need a handful of local stations to get good coverage, but then it's very trivial.

Sec 10y ago
If you have an SDR at hand and want to try it yourself, get the code from GitHub https://github.com/muccc/iridium-toolkit https://github.com/muccc/iridium-toolkit Even with a simple WLan antenna you will get some reception outside (preferrably on a roof).