Product security requirements and security-by-design
State the product's security requirements in terms a test can confirm or refute
Security appears in a product specification as an adjective rather than as a requirement. The decision is to state the product's security requirements in terms a test can confirm or refute. The work starts from whether each stated security property names an actor, a condition and an observable outcome and ends with a product security requirement set with verification methods and owners. It is most relevant to product managers and security architects. A useful result states what was examined, what remains uncertain and which decision the evidence can support.
State the product's security requirements in terms a test can confirm or refute
- Obligation
The starting condition this work depends on.
- Testable property
Where the consequence actually arises.
- Verification evidence
The finding and its open dependencies.
Decision
Frame the decision before scoping the work
Questions and the evidence each one needs
- Obligation
- Inspect the product specification and roadmap.
- Testable property
- Inspect customer and regulatory security obligations.
- Verification evidence
- Inspect the threat model, where one exists.
The decision is to state the product’s security requirements in terms a test can confirm or refute. This matters to product managers and security architects when security appears in a product specification as an adjective rather than as a requirement. Name the affected product, the consequence of a wrong decision and the owner who can act. The opening conversation should establish which evidence already exists and which uncertainty is material enough to investigate.
The specific failure hypothesis is that a requirement to encrypt sensitive data leaves the key holder, the threat and the failure behaviour undefined. It stays a hypothesis until it is examined in your own case. Existing design records, tests or operating evidence may already resolve it, so identify the uncovered question before commissioning further work.
Mechanism
Follow the relationship that carries the consequence
Where the boundary is actually crossed
- Obligation
- The condition the design assumes.
- Testable property
- Where authority or information changes hands.
- Verification evidence
- The effect the owner must answer for.
What this specialty examines
Product security requirements and security-by-design rests on whether each stated security property names an actor, a condition and an observable outcome. Work from the configuration that will actually ship rather than from the reference design, and record where the two differ.
The examination draws on the product specification and roadmap; customer and regulatory security obligations; and the threat model, where one exists. Identify the owner, revision and operating context of each source. Keep an incomplete input visible, with an explanation of what its absence prevents the owner from concluding, rather than quietly treating a gap as a satisfactory result.
The tradeoff to make explicit
The tradeoff here is a requirement strict enough to test against one broad enough to survive a design change. Compare the available options against the same intended outcome. If one option removes a control or moves a boundary, describe that difference before treating its lower effort as an improvement. The decision should expose the tradeoff rather than bury it in a single rating.
Preparation
Connect the inputs to the boundary examined
Preparation record for the engagement
Illustrative working format
- The product specification and roadmap
- Bounds the context.
- Customer and regulatory security obligations
- Supplies the material examined.
- The threat model, where one exists
- Exposes conditions that qualify a result.
Start with the product specification and roadmap; customer and regulatory security obligations; and the threat model, where one exists. Each has a different job: the first establishes context, the second supplies the material to examine, and the third exposes operating conditions that may qualify a conclusion. Sanitised examples can support early work, provided the differences from the real configuration stay explicit.
The scope also needs product managers and security architects with the authority to inspect the relevant boundary, and agreement on what evidence would distinguish the failure in which a requirement to encrypt sensitive data leaves the key holder, the threat and the failure behaviour undefined from acceptable behaviour. Where stakeholders disagree about intended behaviour, resolve that interpretation before classifying an observed difference as a defect.
Working sequence
Carry the question through to an accountable finding
From scoped material to a decision record
- Collect the obligations
Set the conditions assumed.
- Write testable properties
Apply the scoped check.
- Connect requirements to verification
Record evidence and the next decision.
Collect the obligations
Gather customer commitments, regulatory expectations, platform constraints and internal standards that the product must satisfy. Record what is deliberately excluded.
Write testable properties
Restate each obligation as a property with an actor, a precondition and an observable result, separating a design constraint from a verification criterion. Keep an unreproducible observation in the record with its reason.
Connect requirements to verification
Assign each requirement a verification method, an owner and the evidence that would demonstrate it in a release. Hand the result over with its open dependencies attached.
Indicative artefact
Make the artefact usable by the person who owns the decision
A product security requirement set with verification methods and owners
Illustrative working format
- Obligations traced to their source
- What was examined, and under which assumptions.
- Testable security properties
- Each observation, linked to evidence.
- Verification method and evidence per requirement
- The next decision, and its limits.
The proposed decision artefact is a product security requirement set with verification methods and owners. Depending on the agreed scope, the pack may include:
-
Obligations traced to their source. Basis: the definitions, boundaries and assumptions another reviewer would need.
-
Testable security properties. Observation: the findings and their interpretation, preserving adverse results and disagreement.
-
Verification method and evidence per requirement. Decision: what the owner could do next, and what change would justify revisiting it.
Retain the selection rationale beside the result. Without it, a bounded finding is easily mistaken for complete coverage.
Illustrative scenario
Examine the question through a constructed case
A constructed case and its decision paths
Illustrative scenario
- Obligation
A product commits to tenant isolation in a customer contract without defining what isolation covers.
- Testable property
Which resources, identities and failure modes does the commitment actually include?
- Verification evidence
Write the isolation property as a testable statement and agree the evidence a release must produce.
Consider an illustrative situation: a product commits to tenant isolation in a customer contract without defining what isolation covers. The example is constructed to show how the question is framed. No client engagement, executed test or measured improvement is implied.
The question to examine is which resources, identities and failure modes does the commitment actually include. A reasonable next action would be to write the isolation property as a testable statement and agree the evidence a release must produce. The decision record should state which configuration was accepted and which limitations came with it.
Scope and next action
Keep the conclusion inside the agreed boundary
Confirm fit before the next commitment
- Obligation
- Limited to the agreed scope and configuration.
- The product specification and roadmap
- The owner confirms access and conditions.
- Verification evidence
- Requirements describe intent. Meeting them is established by verification evidence, not by their presence in a specification.
Requirements describe intent. Meeting them is established by verification evidence, not by their presence in a specification. Any engagement depends on an agreed scope, a qualified team and authorised access.
Bring the affected product or workflow, its current configuration and the evidence you already hold. The scope question follows from the situation in which security appears in a product specification as an adjective rather than as a requirement. Confirm which missing observation would change the owner’s next action.