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Card-recording-medium-certifying-method-and-apparatus-for-the-recording-medium-forming-system-for-recording-medium-enciphering-system-decoder-therefor-and-recording-medium

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Card recording medium, certifying method and apparatus for the recording medium, forming system for recording medium, enciphering system, decoder therefor, and recording medium

Details

Inventors: Takai, Kazuhito; Fujihara, Shiro;
Assignee: NEC Corporation (Tokyo, JP)
Primary Examiner: Evans; F. L.
Assistant Examiner:
Attorney, Agent or Firm: Foley & Lardner

In a card type recording medium containing a data area where data containing ID information of a holder are recorded, and an image area where image data are recorded, in the image area are recorded second image data which are generated by transforming first image data specifying the holder to frequency-area data, adding the transformed frequency-area data with the ID information and inversely transforming the added data to image signals.

DETAILED DESCRIPTION An object of the present invention is to provide a magnetic card ID information enciphering system in which ID information to be recorded/printed on a magnetic card is made both in the form of magnetic information and in the form of embedding into a pattern of a magnetic card to prevent a third party from easily copying the magnetic card, thereby enhancing security on the magnetic card.
Another object of the present invention is to make it very difficult to forge an ID card by using the electronic watermark technique, and to make it easy to judge whether a holder is a legal holder even when the ID card is forged.
In order to attain the above objects, according to a ciphering/deciphering system for a magnetic card in the present invention, there is provided means for easily judging whether an IC card is illegally forged (copied) or not by providing means for inputting information in a pattern of the card in addition to magnetic data so that the card is easily judged to be copied when a third party illegally copies the magnetic data of the card.
More specifically, a fingerprint pattern of an owner on the basis of which a pattern of an ID card is created is subjected to FFT (Fast Fourier Transform) to transform the fingerprint pattern to frequency-domain information, the ID information is added to a frequency component having strong energy on the basis of the frequency-domain information thus generated, the addition result is subjected to inverse FFT (Fast Fourier Transform) processing to transform the frequency-domain information to a two-dimensional image, and then the fingerprint pattern in which the ID information is embedded is printed on the card.
In an identification process of the ID card thus generated, the fingerprint pattern of the card is read by a reader to transform the read image to the frequency-domain information by the FFT processing.
Thereafter, the fingerprint of the holder is read by the reader to transform the read data to frequency-domain information by the FFT processing

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