I now have fifteen bank cards and pin-codes to remember them quite unrealistic. I keep them in the smart phone in the UPM program. My reader A. blind proposed a very simple method to remember pin-codes from any number of cards.
Think and remember a four-digit master code. It is not necessary to use a birth year or anything like 1111.
We subtract from each digit pin-code card corresponding digit master code. If the result was negative, we add the 10 (mathematicians call is modular subtraction). The result is written in indelible marker on most cards.
Suppose that we have chosen and memorized Master Code 3847And pin-code 5619.
We perform routine subtraction of a column, but does not occupy the unit at senior level.
5619 (a secret PIN code card)
-3847 (secret master code)
2872 (public PIN card)
Get the code 2872 is recorded on the map.
To remember your secret pin code card, it is necessary to carry out the inverse operation - to add to each public figure code written on the card, the corresponding figure of the master code (to produce modular addition). In other words, performs addition of a column, but do not put the unit in the MSB.
2872 (public PIN card)
+ 3847 (the secret master code)
5619 (a secret PIN code card)
That's all a secret pin code is restored.
An additional advantage of this method is that if the card gets into the hands of an attacker, it is likely that he will try to enter the code written in felt pen on the map. And this code is obviously not going to work, and the attacker will be one less try for the selection code.
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