A developer is updating a customer-facing web form that collects an account number, date of birth, and email address. To reduce the risk of SQL injection and data-entry errors, the developer adds logic on both the client and server that rejects any submission unless each field matches predefined patterns (for example, the account number must be exactly 10 digits). Which secure coding control is the developer implementing?
The developer is performing input validation because the code checks that each piece of user-supplied data conforms to an expected format and value range before it is processed or stored. Input validation prevents malformed or malicious input from reaching back-end queries, reducing the likelihood of SQL injection and similar attacks. Output encoding focuses on safely rendering data already stored, patch management addresses software vulnerabilities via updates, and data-at-rest encryption protects stored information rather than vetting data on entry.
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Why is input validation important for application security?
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What are some common techniques or methods used for input validation?
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What is the difference between client-side and server-side input validation?