Authenticator, authenticatee and authentication method

A host device capable of performing an authentication process with a memory device, the host device comprising:

• a decryptor;
• a selector;
• a processor;
• and
• a comparator,
• wherein the host device is configured to:
• receive first data from the memory device;
• generate, by the decryptor, second data based on the received first data;
• receive key index data from the memory device;
• select, by the selector, first key data based on the received key index data;
• transmit first information data and random number data to the memory device;
• generate, by the processor, second key data based on the selected first key data and the random number data;
• generate, by the processor, third data based on the generated second key data and the second data;
• receive fourth data from the memory device;
• and
• compare, by the comparator, the generated third data with received fourth data.

A host device capable of performing an authentication process with a memory device, the host device comprising:

• a decryptor;
• a selector;
• and
• a processor,
• wherein the host device is configured to:
• receive first data from the memory device;
• generate second data by the decryptor decrypting the received first data;
• select, by the selector, first key data based on key index data;
• transmit first information data and random number data to the memory device;
• and
• generate second key data by the processor executing an AES (Advanced Encryption Standard) encryption process based on the selected first key data and the random number data.