- You have a malicious actor on your trusted network.
- If so, you have bigger problems.
This is more likely than you think. There’s more computers than you realise on the average network. Many aren’t updated and have vulnerabilities. If there’s one malware on one machine on your network, that means a malicious actor is on your network.
Common exemples :
- Home WiFi network with old unpached router, Android smartphone, network printer, security camera, thermostat, robot vacuum cleaner, smart lightbulb, smart TV, …
- Unsecure WiFi network at the cafe, train station, hotel, … where you connect a laptops that is sometimes used for printing and which has CUPS
Friction is how classic braking work, and all the energy that goes into friction is lost. Regenerative braking typically rely on magnets and rotors to slow a train. When a train brake, it uses part of its kinetic energy to spin a rotor, which generate electricity using spinning magnets.
The article is otherwise interesting, it’s just unfortunate they got the basic physics wrong.
Reference: Review and trends in regenerative braking energy recovery for traction power system with inverter substation in subway’s of São Paulo city