Dieter Spaar spaar at
Tue Mar 16 08:20:33 UTC 2010

Hello Sebastien,

On Tue, 16 Mar 2010 00:09:46 +0100, "=?UTF-8?Q?S=C3=A9bastien_Lorquet?=" <squalyl at> wrote:
> Sylvain, if I evolve your algorithm, then I think we don't need to store
> anything in EEPROM. Just keep that in RAM and force a renegociation at MS
> boot. What do you think of that?

Just a question: Why do you want to avoid writing Kc to the EEPROM ? The
cards I know have a quite huge number of EPPROM write cycles, e.g. for a
certain MULTOS card the number is specified to be 500.000. I don't know
the number for the card you use, but I expect it to be at least 100.000.
For our purpose this should be really good enough, I would expect more
writes to EF LOCI and EF BCCH than to EF KC.

A question to the list: does anyone know where to get a tool to
cut out a SIM from a standard smart card ? I don't prefer doing this
with a knife or similar, this might only be OK for one or two pieces
and the result also does not look too good.

Best regards,
Dieter Spaar, Germany                           spaar at

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