Patent ID: 7657532

Claim:
A password management device that manages passwords read from an information processing device having a reader/writer, comprising: at least a processor; a password storage section that is configured to store plural passwords; a password state information storage section that stores each of states of the passwords in the password storage section, as password state information, the password state information shows whether the corresponding password is registered in the information processing device; a wireless communication section that when the wireless communication section receives an instruction to write password state information from the information processing device via wireless communication with the reader/writer, writes password state information indicated by the instruction to write password state information, into the password state information storage section, when the wireless communication section receives an instruction to read password state information form the information processing device via wireless communication with the reader/writer, reads password state information from the password state information storage section and sends the password state information to the information processing device via wireless communication with the reader/writer, and when the wireless communication section receives an instruction to read a password from the information processing device via wireless communication with the reader/writer, reads a password from the password storage section and sends the password to the information processing device via wireless communication with the reader/writer; and a control section that determines whether a password registered in the information processing device needs to be changed to a new password or not, based on the password state information stored in the password state information storage section, generates a new password when the determination that the password registered in the information processing device needs to be changed to the new password is made and writes the new password into a storage region different from another storage region of the registered password in the password storage section.