[August 2016] From Stackoverflow

• 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