JP2002118546A5 - Public key handling device, public key handling method and communication device - Google Patents

Claims (11)

A management unit that associates and manages the public key transmitted as a response to the key acquisition request from the external communication device and the address information of the public key user who acquired the public key;
Public key handling, comprising: a key distribution unit that distributes the updated public key to a public key user using address information managed by the management unit when the public key is updated. apparatus. While receiving a key acquisition request from the external communication device, comprising request reception means for acquiring address information of the communication device that has made the key acquisition request,
The public key handling apparatus according to claim 1, wherein the management unit registers the address information acquired by the request receiving unit as the address information of the public key user. User information acquisition from the key generation device when the public key transmitted as a response to the key acquisition request from the external communication device is registered by the key generation device that generated the public key The public key handling device according to claim 1, further comprising key user information transmitting means for transmitting a list of public key users managed by the managing means as a response to the request. A key update information rewriting unit that rewrites the key update information of the public key user managed by the management unit in association with the address information of the communication device when a public key receipt completion notification is received from an external communication device; The public key handling device according to claim 1, further comprising: When the public key transmitted as a response to the key acquisition request from the external communication device is registered by the key generation device that generated the public key, the public key registered by the key generation device When the key update information of all public key users managed by the management means is rewritten to the latest information by the key update information rewriting means, a public key distribution completion notification is transmitted to the key generation device. The public key handling device according to claim 4, further comprising a delivery completion notifying unit. When the key update information of all public key users managed by the management means is rewritten to the latest information by the key update information rewriting means, a key erasure means for erasing the public key before the update is provided. The public key handling device according to claim 4. When a message encrypted using the public key generated by the own device is received from an external communication device, the message is decrypted using the private key generated in a pair with the public key, and the message is decrypted. When it is confirmed that the message is the public key receipt completion notification, the key update information rewriting means relates to the key information of the public key user managed by the management means in association with the address information of the external device. The public key handling device according to claim 4, wherein the public key handling device is rewritten. The public key according to claim 7, wherein the key update information rewriting means rewrites the key update information of the public key user according to an update state of the public key used for encrypting the message. Handling equipment. A communication device comprising: a reception completion notification means for transmitting a public key receipt completion notification to a public key handling device that is a transmission source or a generation source of the public key when an updated public key is received . The receipt completion notifying means encrypts the public key receipt completion notice using the received public key, and transmits the encrypted message to the public key handling device that is the generation source of the public key. The communication device according to claim 9. The public key transmitted as a response to the key acquisition request from the external communication device and the address information of the public key user who acquired the public key are associated and managed,
When the public key is updated, the updated public key is distributed to the public key user using the managed address information.