[Gsmmap] IMSI_Catcher_Score wiki page says nothing about c5 (+ lots of events in Paris)

axel simon axel+srlabs at axelsimon.net
Wed Aug 5 12:19:15 CEST 2015

Hi everyone,

First time poster here. I'm axel, I'm from Paris and I take part in
different activist-y things. Not sure my bio is very relevant right now :)

So, here's the thing. I've been running SnoopSnitch for a few months in
Paris, I used to get a few IMSI catcher alerts here and there, but now
(since version 0.9.7?) I'm seeing many more. I'm up to 95 in the last 7
days, 5 in the last 24 hours.

A lot (most I think) of these happen when I'm on the metro, and I'm
thinking (poorly-educated guess here) that it's a misconfiguration of
the handover between overground and underground cells.

In any case, the majority of the IMSI catcher events have a score of 3:
Score: 3.00, c1=1.0, c5=2.0

I've searched the wiki (and this list's archives) for mentions of c5,
but it seems to be the one type of event about which there is no

Can anyone explain what I should expect from a c5 event? and how bad a
score of 2.0 is? :)

Thanks for your help and for this really interesting tool!

Take care,


Axel Simon
mail / jabber / gtalk: axelsimon at axelsimon.net
twitter: @axelsimon

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