12 Nov
2012
12 Nov
'12
2:19 p.m.
Hi Dieter,
On 12 November 2012 12:39, Dieter Spaar <spaar(a)mirider.augusta.de> wrote:
I've ordered one of those generic test SIMs from eBay and now I just
need to wait for it to arrive from China... The description mentioned
a number of common testers and so I'm guessing it must support XOR.
Hello Andrew,
On Mon, 12 Nov 2012 10:25:19 +0000, "Andrew Back"
<andrew(a)carrierdetect.com> wrote:
Right, so I'm now thinking that the tester UI and documentation is
probably just unclear/misleading.
I'm trying to get some MS test equipment working and have programmed a
SIM with pysim-prog.py, but the tester has a configuration field for
RAND and I cannot see how to set this on the SIM. In fact this has
confused me as I thought the network always supplied this...
Most certainly the RAND value of your MS tester is the value which
is sent during authentication. All MS testers I have seen so far
allow to configure this value, either use random data or set it
to a fixed value. I have the
IMSI, Ki, MCC and MNC set the same on the tester and SIM,
but tests don't get very far and fail with "incorrect SRES".
I would expect that you need a SIM card which supports XOR for
A3/A8. This algorithm is the only one I have seen on nearly all
MS tests sets I have access to. Those test sets usually don't
support COMP128 and its variants (I guess your SIM card only supports
this algorithm), so you need a SIM card which uses the same algorithm
as the MS test set. However if you can set a fixed RAND value on the MS
test set you can
check what your SIM card will return with this RAND and set Kc and
SRES on the test set to those values.
I don't see any way to set SRES and Kc in the tester, sadly, so I
think I will just have to wait and try with the test SIM when it
arrives.
Thanks for your help!
Best,
Andrew
--
Andrew Back
http://carrierdetect.com