I have done a little bit of work with SIM cards in Linux. You should
check out the PCSC project. It isn't the easiest thing to get running,
but it can read and write data to/from SIM cards. (Assuming you have a
reader it supports. I have a Towitoko Chipdrive, and a Cardman 6020
that it works with. I have also gotten in to work with the SIM card
slots on the Dell D620 notebook.) I have used these libraries to
implement EAP-SIM and EAP-AKA functionality in XSupplicant.
Based on my experience working with SIM cards, it seems that copying a
card isn't something that is easy to do. There is a secret value that
is stored on the card that there doesn't seem to be any easy way to gain
access to. This value is what is used to authenticate your SIM to the
network.
The other problem is that an ISO copy is done by reading specific
sectors off the media, and writing those same sectors to the same
location on a different media. SIM card interfaces don't work the same
way. There really aren't any "sectors" that can be read, and written
like this.
Shawn Rutledge wrote:
On Nov 26, 2007 10:49 AM, Cailan Halliday <[EMAIL PROTECTED]> wrote:
I just had an idea that I got from a couple of devices, how about a virtual
SIM card? Is it possible to make an ISO of a SIM card and store it in the
Neo to be, for lack of a better word, booted from? I've seen devices like
these:
http://www.thetravelinsider.com/phones/simsaver.htm
http://www.thinkgeek.com/gadgets/cellphone/9ca8/
There are also cheap USB SIM readers, and I got the impression that
they could write to the card as well. So I got one on ebay. The
software that came with it (only for Windows) could only read the
card. I wish there was a Linux alternative, especially one that can
also write the contacts to the SIM. (But since the Neo itself could
do that, I guess it's no longer necessary.)
Anyway the problem is not just the ability to copy some info from one
SIM to another, but the fact that the SIM has an uncopyable unique
serial number and maybe a hardware crypto engine (?). And the code
for the GSM radio is not open-source. So there is no way to fake the
SIM card. (This was meant to be a feature.) But it might be possible
to emulate a SIM card in hardware, in such a way that different images
could be used at different times; I don't know of any attempts to do
that, but it seems like it should be possible. Then again, maybe
there is a truly private key that cannot be read at all, but can only
decrypt data that has been encrypted with the corresponding public
key.
Or you could try one of the SIM card duplexers that are sold (I never
did... not sure how well they work). Those are meant for people who
travel a lot, to be able to switch to a different SIM without
physically swapping it out each time.
If the point is to clone a SIM card, I'm sure that would be considered
fraudulent, and might play havoc with the network too if they see the
same phone signing on to a couple different cell sites.
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