The PIN Key is a pin code reminder to help you remember your pin codes by using PIN cards. You probably have many PIN codes for your smart phones, bank and credit cards, maybe also for you family. The PIN Key exploits the fact that the brain recognizes patterns better than it remembers digits. The PIN Key uses a color pattern to hide pin codes. The output is a PIN card that hides you PIN codes. In Northern Europe some banks offers a paper solution to its customers using color pattern cards. The security is that only you know the selected pattern.

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