I ended part 2 with the promise that we will discuss about : 2) Intrusion detection and prevention systems (IDS/IPS or IDPS) From Wikipedia: Intrusion prevention systems (IPS), also known as intrusion detection and prevention systems (IDPS), are network security appliances that monitor network and/or system activities for malicious activity. The main functions of intrusion prevention systems are to identify malicious activity, log information about this activity, attempt to block/stop it, and report it. Intrusion prevention systems are considered extensions of intrusion detection systems because they both monitor network traffic and/or system activities for malicious activity. The main differences are, unlike intrusion detection systems, intrusion prevention systems are placed in-line and are able to actively prevent/block intrusions that are detected. More specifically, IPS can take such actions as sending an alarm, dropping the malicious packets, resetting the connection and/or blocking the traffic from the offending IP address.   IDPS for cars? Once inside, an attacker can utilize the vehicle’s internal communication bus and take control of additional modules inside the vehicle, including safety critical systems like the ABS and Engine Electronic Control Units (ECUs). Therefore, there is no “trusted device” anymore. Everything has to be assumed to be compromised. The…