At 07:42 PM 4/18/01 +0200, Richard wrote:
>This could be a problem, any ideas to get around this?

Sounds like the old DTex watchclock scheme, but with "smart keys".

One possible bit of security you could add, is that they have to be punched
in some particular order.
Guards deal with this all the time. You have stations that you have to
check hourly, some twice a shift, and some once a shift.  Most guards will
fall into a pattern anyway. You can dictate that pattern and you can detect
variances from that pattern.
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