Anomaly handling method and anomaly handling device

An anomaly handling method in an in-vehicle network, the anomaly handling method comprising:

• transmitting and receiving messages;
• detecting a message having an anomaly;
• and
• switching, when the anomaly is detected in the detecting, a transmission timing of the message in which the anomaly is detected,
• wherein the switching includes changing a switched transmission timing to which the transmission timing is switched, according to predetermined information,
• the predetermined information includes information indicating a transmission time of the message in which the anomaly is detected,
• the switching includes determining, as the switched transmission timing, a transmission timing according to the information indicating the transmission time, and
• the switching includes generating a pseudorandom number using the information indicating the transmission time as a seed, calculating a remainder of the pseudorandom number using a number of bits of a payload segment of the message in which the anomaly is detected, and determining, as the switched transmission timing, a transmission timing according to the remainder.

An anomaly handling method in an in-vehicle network, the anomaly handling method comprising:

• transmitting and receiving messages;
• detecting a message having an anomaly;
• and
• switching, when the anomaly is detected in the detecting, a transmission timing of the message in which the anomaly is detected,
• wherein the switching includes changing a switched transmission timing to which the transmission timing is switched, according to predetermined information,
• the predetermined information includes a risk of the message in which the anomaly is detected,
• the switching includes determining, as the switched transmission timing, a transmission timing according to the risk,
• the switching is performed when the risk is greater than or equal to a first threshold, and
• the switching further includes performing, when the risk is greater than or equal to the first threshold, a bit shift operation process on a bit string forming a payload segment of the message in which the anomaly is detected, by a bit shift amount according to the risk.

An anomaly handling device in an in-vehicle network, the anomaly handling device comprising:

• a message transmitter/receiver that transmits and receives messages;
• a processor;
• and
• a memory including at least one set of instructions that, when executed by the processor, causes the processor to perform operations including:
• detecting a message having an anomaly;
• and
• switching, when the anomaly is detected in the detecting, a transmission timing of the message in which the anomaly is detected,
• wherein the switching includes changing a switched transmission timing to which the transmission timing is switched, according to predetermined information,
• the predetermined information includes a number of times the anomaly is detected in the detecting,
• the switching includes determining, as the switched transmission timing, a transmission timing according to the number of times the anomaly is detected, and
• the switching includes calculating a hash value of the number of times the anomaly is detected, calculating a remainder of the hash value using a number of bits of a payload segment of the message in which the anomaly is detected, and determining, as the switched transmission timing, a transmission timing according to the remainder.

An anomaly handling device in an in-vehicle network, the anomaly handling device comprising:

• a message transmitter/receiver that transmits and receives messages;
• a processor;
• and
• a memory including at least one set of instructions that, when executed by the processor, causes the processor to perform operations including:
• detecting a message having an anomaly;
• and
• switching, when the anomaly is detected in the detecting, a transmission timing of the message in which the anomaly is detected,
• wherein the switching includes changing a switched transmission timing to which the transmission timing is switched, according to predetermined information,
• the predetermined information includes information indicating a transmission time of the message in which the anomaly is detected,
• the switching includes determining, as the switched transmission timing, a transmission timing according to the information indicating the transmission time, and
• the switching includes generating a pseudorandom number using the information indicating the transmission time as a seed, calculating a remainder of the pseudorandom number using a number of bits of a payload segment of the message in which the anomaly is detected, and determining, as the switched transmission timing, a transmission timing according to the remainder.

An anomaly handling device in an in-vehicle network, the anomaly handling device comprising:

• a message transmitter/receiver that transmits and receives messages;
• a processor;
• and
• a memory including at least one set of instructions that, when executed by the processor, causes the processor to perform operations including:
• detecting a message having an anomaly;
• and
• switching, when the anomaly is detected in the detecting, a transmission timing of the message in which the anomaly is detected,
• wherein the switching includes changing a switched transmission timing to which the transmission timing is switched, according to predetermined information,
• the predetermined information includes a risk of the message in which the anomaly is detected,
• the switching includes determining, as the switched transmission timing, a transmission timing according to the risk,
• the switching is performed when the risk is greater than or equal to a first threshold, and
• the switching further includes performing, when the risk is greater than or equal to the first threshold, a bit shift operation process on a bit string forming a payload segment of the message in which the anomaly is detected, by a bit shift amount according to the risk.