absolutely wrong before Air , its Abis before abis its A links and both of them are plain so both Voice and SMS are plain there , but when they come to Air interface they get ciphered with the same A5/1 or A5/2 cipher , no difference . actually , its GSM frames that are encrypted no matter it contains Voice or SMS or control traffic
> > > ---------- Forwarded message ---------- > From: Frank A. Stevenson <[email protected]> > Date: Tue, Dec 29, 2009 at 1:12 PM > Subject: Re: [A51] Text messages > To: Gregory Maxwell <[email protected]> > Cc: Karsten Nohl <[email protected]>, a51 <[email protected]> > > > On Tue, 2009-12-29 at 04:07 -0500, Gregory Maxwell wrote: > > > Has anyone written much on intercepting text messages? I would expect > > them to be a more interesting demonstration target due to the smaller > > amount of data that needs to be captured and stored… > > The other interesting question in relation to SMS, is whether they are > encrypted at all. It is possible that GSMAs dirty little secret is that > SMS are / (have been) unencrypted (for a long time), and possibly still > are so in some networks. > > http://media.wiley.com/product_data/excerpt/38/04700653/0470065338.pdf > > Middle of page 44. > > "Contrary to the voice data, controlling information is never ciphered > in GSM. In addition, the ciphering is limited to the air interface. > It is needless to say that short messages are transferred over the > signaling network and therefore are never ciphered." > > Frank. > > > > _______________________________________________ > A51 mailing list > [email protected] > http://lists.lists.reflextor.com/cgi-bin/mailman/listinfo/a51 > >
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