Road system in physical world is designed for safe (secure) use – sign board, speed limit, road shoulder, proper lane separation.
There is occasion insecurity taking place. There are many contributing factors such as:
- Adverse weather (low visibility, slippy road, hurricane)
- Malfunctioned equipment (vehicle)
- Collateral damage due to other road accidents
- Body condition of driver, under medical or drug influence
- Inexperienced or negligence drivers
Similar principles apply in cyber world
- Untrained user or human error
- Failure to handle exception situation properly
- Unpatched system components exposing to known vulnerabilities
- Attack from peers nodes of connected system
There is one more contributing factor: if security hasn’t been integrated into design and deployment of the target system, it won’t be secure.