- Never trust any input!
- Validate input from all untrusted sources – use whitelists not blacklists
- Plan for security from the start – it’s not something you can bolt on at the end
- Keep it simple – complexity increases the likelihood of security holes
- Keep your attack surface to a minimum
- Make sure you fail securely
- Use defence in depth
- Adhere to the principle of least privilege
- Use threat modelling
- Compartmentalize – so your system is not all or nothing
- Hiding secrets is hard – and secrets hidden in code won’t stay secret for long
- Don’t write your own crypto
- Using crypto doesn’t mean you’re secure (attackers will look for a weaker link)
- Be aware of buffer overflows and how to protect against them
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