getting MAC failure using osmo-sim-auth for 3G/USIM authentication

[Lukas Kuzmiak]

Hey there,

why would he need K? He's calling Authenticate APDU on the SIM directly.

however, where did you get your AUTN data? 3G authentication is supposed to
be mutual, you have to pass AUTN coming from the correct network, otherwise
the SIM rejects to Authenticate you to the "spoofed" network. Isn't this
your problem?

Cheers!
Lukas


On Mon, Mar 11, 2013 at 6:25 PM, benoit michau <michau.benoit at gmail.com>wrote:

> Hello,
> to perform a 3G authentication with a USIM, you need to know the
> authentication key K and counter SQN within the USIM.
> RAND / AUTN generation is explained in TS 33.102, section 6.3.
>
>
> 2013/3/9 Rupert Lloyd <rupert.lloyd at gmail.com>:
> > Good Afternoon,
> >
> > I am trying to perform USIM/3G authentication using osmo-sim-auth and ran
> > into the same problem as Stefanos:
> > http://lists.osmocom.org/pipermail/simtrace/2012-November/000406.html
> >
> > I followed Benoit's advice to view the details as follows (using the
> inputs
> > from the web page):
> >
> >> rand_bin = stringToByte(a2b_hex('00000000000000000000000000000000'))
> >> autn_bin = stringToByte(a2b_hex('ec9320c2c2000000e1dd22c1ad3e2d3d'))
> >> u.authenticate(RAND=rand_bin, AUTN=autn_bin,ctx='3G')
> >> u.coms()
> >
> > ['INTERNAL AUTHENTICATE apdu: 00 88 00 81 22 10 00 00 00 00 00 00 00 00
> 00
> > 00 00 00 00 00 00 00 10 EC 93 20 C2 C2 00 00 00 E1 DD 22 C1 AD 3E 2D 3D',
> >  'sw1, sw2: 98 62 - undefined status',
> >  (152, 98),
> >  []]
> >
> >
> > From TS 31.102, section 7.3.1 it looks like this means a MAC failure
> (0x98
> > 0x62)
> >
> > Can anyone point me to a resource for computing parameters with a valid
> MAC?
> >
> > Thanks for your attention,
> >
> > Rupert
>
>
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