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@gmail.comwrote:

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@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