Card type recording medium and the authentication method and authentication device, creating systems, encryption scheme, the decoder and the recording medium

摘要

PROBLEM TO BE SOLVED: To improve security by providing information to input in a magnetic card for both of magnetic data and the pattern of the card to prevent a third party from easily duplicate the card and to discriminate when it is duplicated. SOLUTION: Written fingerprint pattern written in the card 25 is read by a card image reader 6 and the image is Fourier-transformed at a high speed by FFT 7. On the other hand, the fingerprint pattern of the present owner himself is read by a fingerprint pattern reader 10 and the data is Fourier- transformed at a high speed by FFT 11. A subtracter 8 subtracts the output of FFT 11 from the output of FFT 7 to extract ID information specifying a user. In addition the magnetic data of the card 25 is read by a magnetic reader 1 and a decoding processor 2 deciphers the code to extract ID information 3. Then ID information 9 extracted from the card 25 and ID information 3 extracted from magnetic data are compared by a comparator 4 and a judging circuit 5 judges illegally duplicated information from the result.