| CPC H04L 12/40013 (2013.01) [B60R 16/0231 (2013.01); H04L 2012/40215 (2013.01); H04L 2012/40273 (2013.01)] | 10 Claims |
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1. A determination device that is mounted in a vehicle and connected to a plurality of vehicle-mounted ECUs so that they can communicate with the determination device, the determination device comprising:
a control unit configured to perform control regarding determination of whether data transmitted from the plurality of vehicle-mounted ECUs is valid,
wherein the data includes first data and second data, and
the control unit is configured to:
obtain a plurality of pieces of the first data and the second data that are transmitted from the plurality of vehicle-mounted ECUs;
derives determination data based on the first data; and
specify, from among a plurality of combinations of identifiers for identifying the first data and identifiers for identifying the second data, valid combinations including identifiers of valid first data and second data and invalid combinations including identifiers of invalid first data or second data, based on the second data and the determination data, and
determine, based on the plurality of identifiers included in the specified invalid combinations and the plurality of identifiers included in the valid combinations, whether the first data or the second data of any identifier included in the specified invalid combinations is invalid so as to determine each of the plurality of vehicle-mounted ECUs has been affected by an unauthorized message.
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