Information Sharing System, Computer, and Information Sharing Method

A computer configured to communicate with an in-vehicle system, comprising:

• a storage part configured to store a server private key, and vehicle state management information indicating a state of the vehicle, the vehicle state management information being used to determine whether keys can be exchanged with the in-vehicle system or not;
• a judgment part configured to compare the vehicle state management information with the configuration information, thereby determining whether keys can be exchanged with the in-vehicle system or not;
• a key generation part configured to generate a first private key and a first public key, in a case where it is determined that keys can be exchanged with the in-vehicle system;
• and
• a signature generation part configured to generate a signature value of the first public key using the server private key,
• wherein the computer sends the first public key and the signature value to the in-vehicle system, and
• wherein the computer receives, from the in-vehicle system, a second public key generated in a case where a combination of the first public key and the signature value is correct.

An information sharing method by an information sharing system that includes a server and an in-vehicle system,

• wherein the server includes a first processor configured to execute programs and a first storage device configured to store the programs,
• wherein the first storage device is configured to store a server private key, and vehicle state management information indicating a state of the vehicle, the vehicle state management information being used to determine whether keys can be exchanged with the in-vehicle system or not,
• wherein the in-vehicle system includes a second processor configured to execute programs and a second storage device configured to store the programs,
• wherein the second storage device is configured to store a public key certificate including the server public key, and
• wherein the information sharing method comprises:
• a step in which the in-vehicle system collects configuration information for a vehicle that has the in-vehicle system installed therein;
• a step in which the server receives the configuration information;
• a determinant step in which the server compares the vehicle state management information with the configuration information, thereby determining whether keys can be exchanged with the in-vehicle system or not;
• a step in which the server generates a first private key and a first public key, in a case where it is determined that keys can be exchanged with the in-vehicle system;
• a step in which the server generates a signature value of the first public key using the server private key;
• a step in which the server sends the first public key and the signature value to the in-vehicle system;
• a step in which the in-vehicle system verifies the first public key and the signature value received from the server, using the public key certificate;
• a step in which the in-vehicle system, in a case where a combination of the first public key and the signature value is deemed correct as a result of the verification, generates a second private key and a second public key;
• and
• a step in which the in-vehicle system sends the generated second public key to the server.