Unencrypted MT

Dario Lombardo dario.lombardo.ml at gmail.com
Wed Jan 9 15:11:50 UTC 2013

Hi list!
As described in Nico Golde's talk at 29c3, mobile operators can deactivate
encryption on MT SMSes. To check if a MT is encrypted I've started 'mobile'
with GSMTAP, and I've sent an sms to the mobile. Encryption seems to be
requested by the network. Now the question is: how can I be sure that
encryption is always activated? Should I exaustively send messages to the
mobile in order to look for unecrypted messages? Or is there some other
way? People who give stats about MNO do exaustive tests, or simply generate
a bunch of events and campute stats on those results?
Thanks for your answers/opinions.
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