sim cloning

[richtar]

Hi boys,
I met following problem:
I try read one sim card using simscan v.2. After 9000 attacs to the card, card program write, that card is probably blocked. I run again simscan and read tmp file, so reading of sim card was runing. After next approx. 9000 attacs program did the same think. At the end, I foun Ki and IMSI, everythink working correctly and card is not blocked. Can anybody explain me this? It was Serbian card. Thanks.:confused:

[SirGraham]

Hi,

Dejan must answer this question (because is his software). I suppose that in the collission funcion was found a error and show it. The collission funcion make a thounsand of operations. One or two can be erroneous and give error.

If the card are working I don´t think more about it.

Regards,
Sir Graham.

[richtar]

I think, that you are right - if card is working, everythink is OK. But otherwise I am interesting on this problem, because I do not know, how many attacks is acceptable for this kind of cards. I am affraid, that if I will have in the next time card from the same operator, there is danger blockd the card but nobody know, after which attach.
What about option STRONG KI? I do not use this, but maybe using it we can solve this problem...

Thanks

[SirGraham]

Hi,

The problem are the COMP128 v1 with limit. This limit are in 65536 authentications. I think if you card are unblocked this is a problem in the comunication. If not the card are blocked forever.

The Strong Ki is to search especials Ki of Gemplus. Gemplus after the V2 use in some card especial Ki that don´t generate collisions....

Regards,
Sir Graham.