Security system apparatus for a memory card and memory card employed therefor

A memory card system comprising:

• a memory card including;
• an enciphering control data storing section for storing coded enciphering control data which, when decoded, reveals predetermined address data and a predetermined password,
• a main memory section for storing data,
• a comparison address data storing section for storing the predetermined address data as reference address data;
• a comparison password storing section for storing the predetermined password as a reference password,
• an address comparison section for comparing the reference address stored in said comparison address data storing section with address data input from a host information processing device;
• a password comparison section for comparing the reference password stored in said comparison password storing section with a password input from a host information processing device, and
• an access control section for controlling access to said main memory section in accordance with the results of the comparisons performed by said address comparison section and said password comparison section;
• and
• a host information processing device which includes a data decoding section for retrieving and decoding the enciphering control data from said enciphering control data storing section of said memory card to reveal predetermined address data and a predetermined password, and outputting the predetermined address data and predetermined password to said address data comparison section and said password comparison section of said memory card respectively;
• wherein said access control section of said memory card allows access to said main memory of said memory card when the address data input to said address data comparison section by said information processing device matches the reference address data stored in said comparison address data storing section and the password input to said password comparison section of said memory card by said host information processing device matches the reference password stored in said comparison password storing section of said memory card.

A memory card for use in an information processing device having a decoder, said memory card comprising:

• an enciphering control data storing section for storing enciphering control data from which a predetermined password can be obtained;
• a main memory section for storing data;
• a comparison password storing section for storing the predetermined password as a reference password;
• a password comparison section for comparing the reference password with a password obtained by the information processing device through decoding the enciphering control data;
• and
• an access control section for controlling access to said main memory section in accordance with the comparison result of said password comparison section,
• wherein said access control section prohibits access to said main memory section by the information processing apparatus when said password comparison section determines that the reference password and the password input from the information processing device do not match.

A memory card for use with an information processing device having a decoder, said memory card comprising:

• an enciphering control data storing section for storing enciphering control data from which predetermined address data and a predetermined password can be obtained by decoding;
• a main memory section for storing data;
• a comparison address data storing section for storing the predetermined address data as reference address data;
• a comparison password storing section for storing the predetermined password as a reference password;
• an address data comparison section for comparing the reference address data with address data obtained by the information processing device through decoding the enciphering control data;
• a password comparison section for comparing the reference password with a password obtained by the information processing device through decoding the enciphering control data;
• and
• an access control section for controlling access to said main memory section in accordance with the comparison results of said password comparison section and said password comparison section,
• wherein said access control section prohibits access to said main memory section by the information processing device when said address data comparison section determines that the address data input by the information processing device and the reference address data stored in said comparison address data storing section do not match or said password comparison section indicates that the password obtained by the information processing device and the reference password stored in said comparison password storing section do not match.