Secret sharing control device, in-vehicle device, in-vehicle system, secret sharing control method, and computer program

An in-vehicle system comprising:

• an in-vehicle network;
• a plurality of information processing units that are connected to the in-vehicle network;
• and
• a secret sharing control device configured to apply a secret sharing method to data received from any one of the plurality of information processing units to generate a plurality of shares, and distribute the plurality of shares among a plurality of transmission destination information processing units selected from among the plurality of information processing units,
• wherein the secret sharing control device includes:
• an information acquiring unit that is connected to the in-vehicle network and acquires, from the plurality of information processing units, confidential suitability information of the plurality of information processing units;
• a distribution destination selecting unit configured to select the plurality of transmission destination information processing units as distribution destinations of the plurality of shares obtained from the data using the secret sharing method from among the plurality of information processing units, based on the confidential suitability information acquired by the information acquiring unit;
• and
• a distributing unit configured to distribute the plurality of shares obtained from the data using the secret sharing method among the plurality of transmission destination information processing units selected by the distribution destination selecting unit.

A secret sharing control method comprising:

• an acquiring step of acquiring, from a plurality of information processing units that are connected to a network, confidential suitability information of the plurality of information processing units;
• a selecting step of selecting distribution destinations of shares obtained from data using a secret sharing method from among the plurality of information processing units, based on the confidential suitability information acquired in the acquiring step;
• and
• a distributing step of distributing the shares obtained from the data using the secret sharing method among the information processing units selected in the selecting step.

A computer program that causes a computer to function as:

• an information acquiring unit configured to acquire, from a plurality of information processing units that are connected to a network, confidential suitability information of the plurality of information processing units;
• a distribution destination selecting unit configured to select distribution destinations of shares obtained from data using a secret sharing method from among the plurality of information processing units, based on the confidential suitability information acquired by the information acquiring unit;
• and
• a distributing unit configured to distribute the shares obtained from the data using the secret sharing method among the information processing units selected by the distribution destination selecting unit.