Hi,

> In the current implementation of EAP-SIM and EAP-AKA authentication,
> the payload of IDENTITY REQ was not handled or handled with only
> attribute ID. 

For EAP-SIM, we just reply identity requests with the configured
identity. The same semantics have been implemented for EAP-AKA just last
week.

> Is there a specific cause for this?  I refer to some document about
> these two authentication mechanism, IDENTITY REQ payload is still
> needed.

We do not support all the glory of these protocols, just the basics (no
Re-Authentication, Pseudonyms, ...). I think we are in the specs when
answering identity requests with our IKE/EAP identity.

> So if I want to simulate the whole procedure of SRES and Kc
> calculating procedure in SIM card, what algorithms should be
> implemented by me. And where I can get the material for comp128-2 and
> comp128-3?

I'm not very familiar with these GSM specs, but there are probably
different variations of these algorithms (this is the case at least for
AKA)...

Regards
Martin

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