Importance

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Abstract

There is provided an IC card having control means (1) and storage means (4), wherein storage means (4) comprises a storage area for storing information thereon, a secret identification number area for storing a predetermined secret identification number thereon, and an error count area for storing the number of times of improper input of the secret identification number, and wherein the control means (1) comprises comparison means (107, 112) for comparing a supplied secret identification number with the predetermined secret identification number stored on the secret identification number area, means (108, 113) for accessing to the storage area when the comparison means indicates coincidence as a result of comparison, error count means (120 to 126) for storing the number of times of discrepancy into the error count area when the comparison means indicates discrepancy as a result of comparison, storage area lock means (102, 104) for inhibiting access to the storage area when the error count means has counted a predetermined number of times, and reset means (151, 152, FIGS. 9A and 15) for invalidating the count of the error count area on the basis of the specific input signal.

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First Claim