Host device, semiconductor memory device, and authentication method

摘要

According to one embodiment, encrypted secret identification information (E-SecretID) and the key management information (FKB) are read from a memory device. Encrypted management key (E-FKey) is obtained using the key management information (FKB) and index information (k). The index information (k) and the encrypted management key (E-FKey) are transmitted to the semiconductor memory device. An index key (INK) is generated using the first key information (NKey) and the received index information (k). The encrypted management key (E-FKey) is decrypted using the index key (INK) to obtain management key (FKey), which is transmitted to the host device.

主权项

1. A memory card comprising:
a controller; and a memory device controlled by the controller, and storing secret data, encrypted secret data, and family key block data, the secret data being prohibited from being read, the encrypted secret data and the family key block being readable, wherein the memory device includes: a first area which stores a data element for an authentication process and is unreadable; a second area which stores the encrypted secret data, and is readable; and a third area which stores the family key block data, and is readable and writable, wherein the controller is configured to: read the family key block data from the third area and send the family key block data to a host device in response to receiving a read command of the family key block data from the host device, read the encrypted secret data from the second area and send the encrypted secret data to the host device in response to receiving a read command of the encrypted secret data from the host device, and send constant number data received from the host device to the memory device in response to receiving a command for obtaining authentication information data from the host device, send data for obtaining family key data calculated by the memory device, and send authentication information data to the host device, wherein the memory device is configured to: generate data for obtaining family key data and authentication information data by an internal calculation process; and send the data for obtaining the family key data and the authentication information data to the host device via the controller.