MEMORY CONTROLLER, SECURE MEMORY CARD, AND SECURE MEMORY CARD SYSTEM

摘要

It is possible to solve the problem that trouble for a exchange of a signature is generated and a certain time is required. A secure memory card includes: communication means fore receiving encryption data and signature object data; encryption/decryption means for encrypting/decrypting arbitrary data; correlation means for correlating the signature object data to the signature stored in the encryption data decrypted by the encryption/decryption means; judging means for judging whether the signature object data is valid according to the correlation result performed by the correlation means; and storage means used when the signature object data is judged to be valid by the judging means, for storing the data other than the signature in the encrypted data containing the signature as valid data.