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Bitlocker numeric password validation

 
General (Technical, Procedural, Software, Hardware etc.)
Last Post by C.R.S. 13 years ago
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 C.R.S.
(@c-r-s)
Estimable Member
Joined: 14 years ago
Posts: 170
Topic starter 14/08/2012 3:01 am  

Hi,

Microsoft explains regarding Bitlocker's numeric recovery passwords

Because the 48-digit recovery password is long and contains a combination of digits, the user might mishear or mistype the password. The boot-time recovery console uses built-in checksum numbers to detect input errors in each 6-digit block of the 48-digit recovery password, and offers the user the opportunity to correct such errors.

http//technet.microsoft.com/en-us/library/cc771778.aspx

Is there any first handed documentation on this in detail?

Thank you!

-Richard


   
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 mscotgrove
(@mscotgrove)
Prominent Member
Joined: 17 years ago
Posts: 940
14/08/2012 2:52 pm  

This sounds very insecure. It would indicate that all that is required is to crack 8 x 6 byte passwords. This is assuming you can find the checksums


   
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jaclaz
 jaclaz
(@jaclaz)
Illustrious Member
Joined: 18 years ago
Posts: 5133
14/08/2012 4:11 pm  

Is there any first handed documentation on this in detail?

This sounds very insecure. It would indicate that all that is required is to crack 8 x 6 byte passwords. This is assuming you can find the checksums

There is this article that explains how checking the 6 digit blocks is not that much of an issue
http//blogs.msdn.com/b/si_team/archive/2006/08/10/694692.aspx

jaclaz


   
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 C.R.S.
(@c-r-s)
Estimable Member
Joined: 14 years ago
Posts: 170
Topic starter 14/08/2012 11:49 pm  

There is this article that explains how checking the 6 digit blocks is not that much of an issue
http//blogs.msdn.com/b/si_team/archive/2006/08/10/694692.aspx

Thank you, this helps me a lot - completely on the wrong way with my ideas.
It is meant for search & identification of this data.


   
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