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Question
What is the difference between Safety and Security in software systems?
Answer
Safety protects people from the system; security protects the system from people.
* The CIA triad — confidentiality, integrity and availability, the goals security protects. — Michel Bakni, CC BY-SA 4.0, via Wikimedia Commons. *
Safety and Security protect different things in opposite directions:
| Aspect | Safety | Security |
|---|---|---|
| Goal | Avoiding hazardous situations | Defense against intrusion and unauthorized use |
| Protects | Humans and environment FROM systems | Systems FROM humans |
| Threat | Malfunctioning systems | Malicious or criminal intent |
Tip: Safety = Systems don't hurt people. Security = People don't hurt systems.
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