| 摘要 |
PROBLEM TO BE SOLVED: To provide a cryptographic communication method and apparatus which provides non-significant result even when decoding process is executed. SOLUTION: When a transmission data is generated for the data to be transmitted or received between an IC card and a reader/writer 4, the encryption process is executed to this transmitting or receiving data. Thereafter, a pseudo information consisting of one or a plurality of non-significant information pieces such as random numbers are inserted to the encrypted data with the preset system which will be explained later and these data are then transmitted (ST10 to 13). Moreover, when the data is received, the pseudo information is extracted from the receiving data with the preset system explained later. Subsequently, the decoding is executed to analyze the decoded data (ST15 to 18).
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