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Input validation is a fundamental security measure in application and business systems development, as it ensures that the data entering a system is accurate, properly formatted, and safe for processing. Without proper validation, applications become vulnerable to a wide range of attacks, such as SQL injection, cross-site scripting, buffer overflows, and logic manipulation. Basic input validation approaches aim to enforce data integrity, mitigate malicious input, and prevent unintentional errors that can disrupt business operations. One of the most common approaches is whitelisting, which defines a set of acceptable inputs and rejects anything _______ ________ _____ _____ _____ ________ ______ ______ ________.
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