Sim

dexter zero-kelvin at gmx.de
Mon Mar 15 22:27:09 UTC 2010


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Hello Sébastien

> However, I known nothing to the GSM protocol and don't understand why the Kc
> must be saved. This value is generated from the RUN GSM ALGORITHM command,
> isn't it? According to the spec, is the ME supposed to backup the last
> computed key or something like that?

No idea, but they backup a lot stuff, like last used ARFCNs and so on.

> However, I cannot find a file for the famous "cannot be read" Ki used as
> input to the RUN GSM ALG command. Is this key not stored in a SIM file? Not
> documented in the spec? I think I will do that even if not specified.

I think it is stored in a file, but the read access will be disabled,
but you are right, the spec does not specify an EF:KI or anything semilar.

You could try to select all files 0000 to FFFF maybe you find something
undocumentated ;-)

> "stored in the SIM" means nothing special, so what's not forbidden is
> allowed. Ki will be in a file too. Does someone see a problem with this?

No, that should be absolutely no problem - no phone will ever do a
select to this file ;-)

Regards.
Philipp
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