1

Layered security, also known as layered defense, describes the practice of combining multiple mitigating security controls to protect resources and data.

How to convince someone to use layered security? While rejecting counterarguments like: "

  1. We already have a rock-solid firewall...
  2. He always installs all security updates...
  3. I use HTTPS on all my pages...

... that should be enough!"

2

You don't always put in every single possible mitigation you can think of. There is a cost to this. Security is always a compromise between risk, cost, and usability.

If you are currently in a position where you need to assess the risk of a particular threat, I suggest you take a look at OWASP's risk rating methodology .

If you follow a rigorous and objective methdology, your peers are more likely to be convinced. And you have to be open to the possibility that the methodology yields an answer you don't like.

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