itwbennett writes: 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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