Difference between revisions of "NCK Brute Force"

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(Feasibility)
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This is a theoretical exploit which involves brute forcing the NCK from the [[seczone]] the CHIPID and the NORID. So far no one has made public an instance of NCK discovery using this theortical approach.
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This is a theoretical exploit which involves brute forcing the NCK from the [[seczone]] the CHIPID and the NORID. So far no one has made public an instance of NCK discovery using this theoretical approach.
   
 
==Credit==
 
==Credit==
gray, geohot
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[[gray]], [[User:Geohot|geohot]]
   
 
==Feasibility==
 
==Feasibility==
Given that [[NCK]]s are 15 digits long, the keyspace is log(10^15)/log(2)~=2^50 This would be searchable if all the cryptography used was symmetric. But the algo is TEA(RSA(token), NCK+CHIPID+NORID) [[http://en.wikipedia.org/wiki/Tiny_Encryption_Algorithm TEA]]. So that inside [[http://en.wikipedia.org/wiki/RSA RSA]] has to be done. A modern machine can search the 8 digit keyspace in about 5 minutes, which means we need a couple orders of magnitude speed increase to consider 15 digit.
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Given that [[NCK]]s are 15 digits long, the keyspace is 10<sup>15</sup> (about 2<sup>50</sup>). This would be searchable if all the cryptography used was symmetric. But the algorithm is TEA(RSA(token),[[NCK]]+[[CHIPID]]+[[NORID]]) [[wikipedia:Tiny Encryption Algorithm|TEA]]. So that inside [[wikipedia:RSA|RSA]] has to be done. A modern machine can search the 8 digit keyspace in about 5 minutes, which means we need a couple orders of magnitude speed increase to consider 15 digit.
   
 
==Implementation==
 
==Implementation==
[http://lpahome.com/nckbf/nckbf.rar Multithreaded NCK Brute Forcer]
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[http://george.insideiphone.com/index.php/2007/12/16/brute-force-on-nck-is-impossible/ Multithreaded NCK Brute Forcer] discussion and link to download.
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[[Category:Baseband]]
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[[Category:Unlocking Methods]]

Latest revision as of 00:15, 6 May 2011

This is a theoretical exploit which involves brute forcing the NCK from the seczone the CHIPID and the NORID. So far no one has made public an instance of NCK discovery using this theoretical approach.

Credit

gray, geohot

Feasibility

Given that NCKs are 15 digits long, the keyspace is 1015 (about 250). This would be searchable if all the cryptography used was symmetric. But the algorithm is TEA(RSA(token),NCK+CHIPID+NORID) TEA. So that inside RSA has to be done. A modern machine can search the 8 digit keyspace in about 5 minutes, which means we need a couple orders of magnitude speed increase to consider 15 digit.

Implementation

Multithreaded NCK Brute Forcer discussion and link to download.