There is this European online shop who audits their customer payments by asking them to submit picture of their credit card unencrypted via unsecured public email system. (to be fair enough with some numbers masked).
Ad-hoc I calculated brute force crack of (average) 500.000 combinations per card to find missing information and steal completely valid credit card. Now, thinking how long it will be before this makes news on how yet another company has been hacked. Beware where do you shop !!
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