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Security · interview question

A bug appears around input validation. What is the strongest first debugging move?

Multiple choiceEasychapter-17-curatedpremiumsecurityinput-validation
python
def normalize_order_id(order_id: str) -> str:
    if not order_id.startswith("ORD-"):
        raise ValueError("invalid order id")
    return order_id
Choose one answer
Answer and explanation

Correct answer

D. Trace one concrete example, inspect the state transitions, and compare them to the intended rule before rewriting anything.

Why

That approach is reliable because it creates evidence. Assuming user or partner input is well-formed spreads insecurity through the entire workflow.

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