What does ‘secure by design’ mean?

“Secure-by-design” is the antithesis of the approach where a product is designed and then security is added as an afterthought.

In secure-by-design, we build security into the product right from the start.

Secure-by-design is an approach to both software and hardware development. Secure-by-design is both technology and process. It is the analysis of the risks leading to the selection of security features followed by the application of rigorous design methodology to implement the whole design.