– Only card holder will be able to give missing numbers that he will have learned to recognize via the revealing cache received by post or by digital solution from banking area.
– This serie is required in any online payment. So, the robber who is asked for the card number will be stopped during transaction.
– Even a merchant will no longer be able to copy security data.
*Cardan grid : grid of numbers from steganography, name of the mathematician, Jérôme CARDAN, which consists of hiding a code in a numbers grid.