Originally Posted By: hybrid8
When someone finds one of those Emue cards with 4 digits on the back clearly more worn than the others, I don't think it's going to matter how much encryption is used.

Yeah, that's why people report cards missing. If you lose your key, regardless of whether it's to your bank account or your house, the only thing you can do is change the locks.

Originally Posted By: hybrid8
to simply make something to dump the small amount of data from a bar code

What are you talking about?
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Bitt Faulk