US 12,463,971 B2
Detection device, detection method, and detection program
Hiroyuki Tsukamoto, Osaka (JP); and Hiroshi Ueda, Yokkaichi (JP)
Assigned to Sumitomo Electric Industries, Ltd., Osaka (JP); Sumitomo Wiring Systems, Ltd., Yokkaichi (JP); and AutoNetworks Technologies, Ltd., Yokkaichi (JP)
Appl. No. 18/265,441
Filed by Sumitomo Electric Industries, Ltd., Osaka (JP); Sumitomo Wiring Systems, Ltd., Yokkaichi (JP); and AutoNetworks Technologies, Ltd., Yokkaichi (JP)
PCT Filed Sep. 8, 2021, PCT No. PCT/JP2021/032961
§ 371(c)(1), (2) Date Jun. 6, 2023,
PCT Pub. No. WO2022/137661, PCT Pub. Date Jun. 30, 2022.
Claims priority of application No. 2020-216834 (JP), filed on Dec. 25, 2020.
Prior Publication US 2024/0114028 A1, Apr. 4, 2024
Int. Cl. H04L 9/40 (2022.01); G07C 5/00 (2006.01)
CPC H04L 63/10 (2013.01) [G07C 5/008 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A detection device configured to detect an unauthorized message in an in-vehicle network, comprising:
circuitry configured to
monitor a periodic message that is periodically transmitted and an event message that is non-periodically transmitted, as messages in the in-vehicle network, each message having, assigned thereto, identification information of a transmission source and a sequence number;
change a counter value corresponding to the identification information, when the detection device has received the event message from the in-vehicle network; and
compare, in a first step, the sequence number with the counter value, based on a result of monitoring by the circuitry, and perform provisional determination for detection of an unauthorized message, based on a result of the comparison, wherein
conclusively determine, in a second step, the unauthorized message, based on an interval of messages that satisfy a predetermined condition regarding the sequence number, among messages to which the same identification information is assigned, and on a predetermined transmission cycle of the periodic message.