The two possible default positions on security matters are:
1. Default deny - "Everything, not explicitly permitted, is forbidden"
- Improves security at a cost in functionality.
- This is a good approach if you have lots of security threats.
- See secure computing for a discussion of computer security using this approach.
2. Default permit - "Everything, not explicitly forbidden, is permitted"
- Allows greater functionality by sacrificing security.
- This is only a good approach in an environment where security threats are non-existent or negligible.
- See computer insecurity for an example of the failure of this approach in the real world.
Read more about this topic: Security Engineering
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