Buckinghamshire CC ANPR cameras

[John Wilson]

On 10 January 2012 12:43, Clive D.W. Feather <clive at davros.org> wrote:
> John Wilson said:
>> The hash doesn't change over time. There's a FOI response from the
>> Highways Agency which confirms that.
>> (http://www.whatdotheyknow.com/request/48353/response/124187/attach/html/2/FOI%20response%20ref%2013068772.doc.html)
>
> Actually, it doesn't say that.
>
> If the person writing the answer thinks of the hash algorithm as being
> based on (say) the date rather than the date being something that's hashed,
> they would have answered the way they did.

The Highways Agency have asid that the hash involves the use of a
prime number. The make no mention of date.

If you used the date you'd losse track of all vehicles at midnight
wich is a pretty bad idea.

John Wilson