Buckinghamshire CC ANPR cameras

Clive D.W. Feather clive at davros.org
Mon Jan 9 15:26:18 GMT 2012

Chris Edwards said:
> I guess hashing a registration is pretty easy to reverse.  With access to 
> the DVLA database of all UK registrations, you simply compute the hash for 
> each one.  This is a one off task.  Once you've done it, you know the 
> registration for any given hash.

You don't even need access to the database. The range of possible
registrations isn't that much larger, and it will deal with fake
registrations as well.

(Hmm, how much larger is it? Let's see. The possible registrations are,

    aa nnnn, nnnn aa, aaa nnn, nnn aaa, aaa nnn a, a nnn aaa, aa nn aaa
     6.25M    6.25M    14.4M    14.4M    302M       302M

The last set is 153M so far, growing at 14.6M per annum. So about 800
million at the moment.]

Clive D.W. Feather          | If you lie to the compiler,
Email: clive at davros.org     | it will get its revenge.
Web: http://www.davros.org  |   - Henry Spencer
Mobile: +44 7973 377646

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