MAGNETIC CARD PROCESSOR FOR PROCESSING MAGNETIC CARD AND MAGNETIC CARD PROCESSING METHOD, AND ITS MAGNETIC CARD ISSUING MACHINE AND MAGNETIC CARD ISSUING METHOD

摘要

PROBLEM TO BE SOLVED: To prevent a magnetic card from forgery and alternation by separating a first information and a second information recorded in a magnetic layer and by extracting the first information separated from the first information and the second information read. SOLUTION: The magnetic card is read with a reading head 18, a reading content is demodulated with a reading circuit 27 and fed to a cryptoanalysis part 28. Also, initial information is read, the reading content is demodulated with the reading circuit 27 and outputted to a main controller 21. Also, a pulse signal is fed from a peak detector 27a with a window outputting part 27c, and the window signal for detecting a differential time is outputted to a N signal extracting part 27d and S signal extracting part 27e after a prescribed time has elapsed. Only a pulse signal with a recording waveform is extracted with the signal N signal extracting part 27d and outputted to the crytoanalysis part 28. Also, only a pulse signal with the recording waveform in a S magnetic body is extracted with the S signal extracting part 27e and outputted to the crytoanalysis part 28. An encipherment key is deciphered with the crytoanalysis part 28.