| 摘要 |
PROBLEM TO BE SOLVED: To provide a secret information processing device which protects information to be secret.SOLUTION: A secret information processing device comprises: holding means which holds a first secret value; and authentication means which includes authentication information from a user device and authenticates the user device, when receiving a first command which requests data, by inspecting authentication information of the first command which is received on the basis of the first secret value. The authentication means, when authentication of the user device which has transmitted the first command is unsuccessful, starts a first mode to select acknowledgement or negative acknowledgement at random, as a response to the command to be received from the user device subsequently.SELECTED DRAWING: Figure 1 |
