A small device built by legendary hacker Samy Kamkar can predict what new American Express card numbers will be
and trick point-of-sale devices into accepting cards without a security
microchip.
Because American Express appears to have used a weak
algorithm to generate new card numbers, the device, called MagSpoof, can
predict what a new American Express card number will be based on a
canceled card's number.
The new expiration date can also be predicted
based on when the replacement card was requested.
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