Patent ID: 6079019
Filing Date: 2000-06-20
Classification: G06F

Abstract:
An IC memory card having an interface section for connecting the IC memory card to an external host system apparatus as an information processing apparatus and a memory section for storing data including enciphered data which are sent from the external host system apparatus through the interface section, the IC memory card comprising:a password check circuit that compares a password input from the host system apparatus with a predetermined password to output a password comparison result, anda data decipherment circuit that deciphers the enciphered data read out from the memory section and outputs deciphered data to the host system apparatus through the interface section, if the passwords coincide with each other,said data decipherment circuit outputting the enciphered data read out from the memory section, without decipherment, to the host system apparatus through the interface section if the passwords do not coincide with each other,wherein the enciphered data that is deciphered by said data decipherment circuit when the passwords coincide with each other is the same enciphered data output from said data decipherment circuit when the passwords do not coincide with each other.