Secure Software Requirements

Secure software requirements are the written commitments describing how a system must stay reliable, resilient, and recoverable, agreed before anyone writes code.

Key concepts

• Write security requirements as testable statements. “Be secure” cannot be verified, but “lock the account after five failed attempts” can. If nobody can test it, it is a wish.
• Cover reliability, resilience, and recovery explicitly. State the expected uptime, the behavior during failure, and how fast data must be restored. Vague expectations become arguments during an outage.
• Capture the obligations that come from outside. Contracts, regulations, and customer commitments all impose requirements you do not get to choose, so gather them early.
• Define who may do what. Roles, permissions, and data handling rules belong in the requirements. Do not leave them to guesswork by whoever writes that screen.
• Requirements change over time. Keep them versioned and reviewed so the system you build still matches what was agreed. Changes should stay visible to everyone involved.

Why it matters for your business

Requirements are the cheapest place to close a security gap and the hardest place to notice one missing. Clear documentation also gives auditors and prospective customers a straight answer instead of a shrug. When an external framework drives those obligations, CMMC compliance support can translate the rules into requirements your developers can act on.