Buckinghamshire CC ANPR cameras
ukcrypto at sourcetagged.ian.co.uk
Tue Jan 10 09:07:57 GMT 2012
On 9 Jan 2012, at 17:32, Roland Perry wrote:
> In article <4F0B222B.9090406 at zen.co.uk>, Peter Fairbrother <zenadsl6186 at zen.co.uk
> > writes
>> If the hash function is such that the hash changes say every day,
>> or better for every rush hour, then very little private data would
>> be available.
> I seems it isn't.
> But if one has access to the output data, then it occurs to me that
> an easy attack on the hash function (for a particular plate) would
> be to drive a car, with that as a false numberplate, past a camera
> at 3am, then looking at the results in the morning.
Or to put it in cryptographic terms - a known plaintext attack with
complexity of O(1). When put like that, it's so starkly ineffective a
protection it amounts to no protection at all.
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