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.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@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