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The Secure Development Lifecycle (SDL) is a process that integrates security practices into every phase of software development — from requirements gathering to deployment and maintenance. Rather than treating security as an afterthought or a final review gate, the SDL embeds security thinking throughout the entire development process.
The cost of fixing security vulnerabilities increases exponentially the later they are discovered:
| Phase Discovered | Relative Cost to Fix |
|---|---|
| Requirements/Design | 1x |
| Development/Coding | 5x |
| Testing/QA | 10x |
| Production | 30x–100x |
Finding and fixing a vulnerability during design is far cheaper than responding to a breach in production. The SDL aims to shift security left — addressing it as early as possible.
Define security requirements alongside functional requirements:
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