What is the primary purpose of input validation?

What is the primary purpose of input validation?

• A. It helps ensure data integrity by preventing bad data from entering the system.
• B. It helps ensure data integrity and reduces security risks.
• C. It guarantees no performance impact.
• D. It ensures data is encrypted.

Answer: (B)

Input validation checks that incoming data matches expected types, formats, and constraints before it’s used. This is crucial for data integrity because it stops invalid values from entering the system and potentially corrupting data or breaking business rules. It also reduces security risks by blocking or sanitizing inputs that could be exploited by attackers, such as SQL injection or cross-site scripting. There can be some performance cost due to validation logic, but the main goal is correctness and safety, not eliminating all overhead. Encryption is a separate concern tied to confidentiality, not validation.

Input validation checks that incoming data matches expected types, formats, and constraints before it’s used. This is crucial for data integrity because it stops invalid values from entering the system and potentially corrupting data or breaking business rules. It also reduces security risks by blocking or sanitizing inputs that could be exploited by attackers, such as SQL injection or cross-site scripting. There can be some performance cost due to validation logic, but the main goal is correctness and safety, not eliminating all overhead. Encryption is a separate concern tied to confidentiality, not validation.