monsitj/iStock/Getty Images Plus Follow ZDNET:  Add us as a preferred source  on Google. ZDNET's key takeaways App security needs board-level accountability. Culture can make or break secure-by-design work. An operating model turns prevention into practice. Businesses are focusing on software strategies that transform cybersecurity outcomes . The challenge is to bake security early in the development cycle  and build the tools and techniques that catch bugs and vulnerabilities before they become monsters. In this article, we consider the transition from reactive to preventive as a cultural mandate and how leadership must elevate security from a post-launch fix-it approach to a pre-launch design-in strategy. Traditional application security finds and patches flaws, usually post-release. Secure-at-the-source is a strategic approach that tries to prevent issues from ever existing. But there's more to the approach than that, especially at the enterprise level.…