brute force - GSM-Forum

sergei56 · 02-04-2003, 08:39

I do not understand, brute force a dangerous or safe method for search KI?

SirGraham · 02-04-2003, 09:57

Hi sergei56,

The brute force is a safe method for search KI. but is more.... more... slowly......

The problem with you search the ki is that some cards have a limit in the number maximous of authentications.
Normaly, The sim makes one autentication every 2 Days (this ratio can be changed. Depends of the factors).
If you put a limit in the card (more less 65536), the life of the card is more of 2 years...

... But if you search the Ki, the colission method makes into SIM about 150.000 authentifications (to search all Ki).
More programs SIM_SCAN, XSim mixed the two method to search the Ki, part with the collision method and part with the Brute force...
However, the brute force only is operative in the last 4 bytes of Ki 2^32. More of 4 bytes, There is a lot of combinations to solve in a operative time...

Best Regards,
Sir Graham.

sergei56 · 02-04-2003, 17:33

Thank SirGraham

02-04-2003, 08:39	#1 (permalink)
sergei56 Junior Member Join Date: Nov 2001 Posts: 5 Member: 7401 Status: Offline Thanks Meter: 0	brute force I do not understand, brute force a dangerous or safe method for search KI?

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02-04-2003, 09:57	#2 (permalink)
SirGraham No Life Poster Join Date: Aug 2002 Posts: 628 Member: 15073 Status: Offline Thanks Meter: 12	Hi sergei56, The brute force is a safe method for search KI. but is more.... more... slowly...... The problem with you search the ki is that some cards have a limit in the number maximous of authentications. Normaly, The sim makes one autentication every 2 Days (this ratio can be changed. Depends of the factors). If you put a limit in the card (more less 65536), the life of the card is more of 2 years... ... But if you search the Ki, the colission method makes into SIM about 150.000 authentifications (to search all Ki). More programs SIM_SCAN, XSim mixed the two method to search the Ki, part with the collision method and part with the Brute force... However, the brute force only is operative in the last 4 bytes of Ki 2^32. More of 4 bytes, There is a lot of combinations to solve in a operative time... Best Regards, Sir Graham.

02-04-2003, 17:33	#3 (permalink)
sergei56 Junior Member Join Date: Nov 2001 Posts: 5 Member: 7401 Status: Offline Thanks Meter: 0	Thank SirGraham