{"id":1011,"date":"2021-03-19T05:51:00","date_gmt":"2021-03-19T05:51:00","guid":{"rendered":"https:\/\/www.commsignia.com\/?p=1011"},"modified":"2022-02-18T13:32:53","modified_gmt":"2022-02-18T13:32:53","slug":"were-not-waiting-for-april-fools-day-to-detect-misbehavior","status":"publish","type":"post","link":"https:\/\/www.commsignia.com\/blog\/were-not-waiting-for-april-fools-day-to-detect-misbehavior\/","title":{"rendered":"We\u2019re not waiting until April Fools for misbehavior detection"},"content":{"rendered":"\n
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Misbehavior detection is when a message is sent between vehicles and then flagged as false. Misbehavior can endanger lives, therefore both malicious and unintentionally wrong V2X messages must be filtered out on all 365 days of the year.<\/p>\n\n\n\n

There\u2019s an app for that!<\/h2>\n\n\n\n

Well, not on your phone, I\u2019m not referring to the decade old commercial<\/a>. It\u2019s an app in our vehicle-to-everything stack, and it\u2019s called misbehavior detection.<\/p>\n\n\n\n

An early example of misbehavior detection is basically all about checking the values in consecutive Cooperative Awareness Messages (CAM) to expose a liar. For a starter you have to know that CAM messages contain a lot of information about a vehicle: position, heading, speed, acceleration and the vehicle\u2019s type. The message says a car is reversing towards us at 200 km\/h? Obviously nonsense. Traveling with a normal 50 km\/h, but the GPS coordinates are always the same? Hardly believable. How about a 23 meters long motorcycle? Not even Batman\u2019s bike in the movie reached that size. <\/p>\n\n\n\n

So these were the easier cases.<\/p>\n\n\n\n

At the last Car2Car week event Andras Varadi, head of Commsignia research and Daniel Magyar research intern gave a presentation about much more complex issues involving multiple sensors and V2X units.<\/p>\n<\/div>\n\n\n\n

<\/div>\n<\/div>\n\n\n\n
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Infrastructure as a vigilante<\/h2>\n\n\n\n

In the first case the infrastructure helps drivers assess the situation. The information sharing is done with Cooperative Perception Message (CPM)<\/a> and, as the name implies, these messages contain data about objects detected by various sensors and cameras. In our case the V2X roadside unit (RSU) at the intersection is connected to a camera. We simulate a case when its input is not verified and as a consequence it is possible that it sends a corrupted CPM message to vehicle B. The message says that vehicle A occupies the intersection.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

But vehicle B\u2019s own on-board sensors detect free space at the phantom car\u2019s alleged location. Our misbehavior detection algorithm doesn\u2019t just make a decision based on the vehicle\u2019s own sensor, but also reports the RSU to the Misbehavior Authority. <\/p>\n\n\n\n

Denouncing a V2X device is an integral part of V2X safety, it prevents additional future false messages from being accepted by anyone in the traffic. However, since this process can take time, Commsinia software also helps maintain safety right away. What\u2019s more, vehicle B shares its own view of the situation \u2013 that there is nobody in the intersection \u2013 using CPMs to contradict the roadside unit.<\/p>\n\n\n\n

In the second simulated case, vehicle A plays the culprit. It sends a corrupted CAM message with wrong speed and location data, claiming that it\u2019s fully stopped in the middle of the intersection. The RSU works correctly, recognizes that the vehicle is already away and there\u2019s a drivable free space at the intersection. So the RSU sends out a CPM message containing freespace information.<\/p>\n\n\n\n

\"\"
caption<\/figcaption><\/figure>\n\n\n\n

Vehicle B receives both the wrong CAM and the right CPM messages, and the misbehavior detection algorithm running on the vehicle\u2019s V2X onboard unit checks both data.<\/p>\n\n\n\n

Only Commsignia\u2019s special algorithm allows vehicle B to recognize the misbehavior from the pairing anomaly, and warn the driver of a potential danger.<\/p>\n<\/div>\n\n\n\n

<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Misbehavior detection is when a message is sent between vehicles and then flagged as false. Misbehavior can endanger lives, therefore both malicious and unintentionally wrong V2X messages must be filtered out on all 365 days of the year. There\u2019s an app for that! 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