full-disclosure - Re: [FD] Master Lock random key code generation/distribution Fails

Open Source and information security mailing list archives

Date: Wed, 26 Mar 2014 17:17:01 -0500
From: Daniel Miller <bonsaiviking@...il.com>
To: Jon Hart <jhart@...ofed.org>, fulldisclosure@...lists.org
Subject: Re: [FD] Master Lock random key code generation/distribution Fails

On 03/26/2014 05:03 PM, Jon Hart wrote:
> This is definitely an interesting finding.  I'll admit that I don't know
> what the key code actually does or how it is used, but at the risk of
> stating the obvious this is physical world equivalent of problems we face
> daily in the infosec field -- randomization is hard, small key spaces are
> bad, and vendors will continue to make this mistake (hopefully) until it is
> disclosed.
>
> -jon
Jon,

The key code is used to identify locks that share the same key. For a 
pin tumbler lock, it usually corresponds exactly to the height of each 
of the pins in order. So the key code 2685 in the image probably looks 
something like this:

|^\
|..|
|..\___
|......|
|......\_
|........|
|......_/
|.....|
*******

Dan

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