| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for hiding information based on simpler configuration, which can prevent reading and writing of information by an IC module without a data encryption function. SOLUTION: Information (13) to be written in an IC module (1) is encrypted using an ID number (11) of the IC module (1) and an encryption variable (12) set by a user, and the encrypted information (13a) is written in the IC module (1). The encrypted information (13a) written in the IC module (1) is read out, and the read-out information is decrypted, based on the ID number (11) and the encryption variable (12).</p> |
