Web Security: Common Vulnerabilities And Their Mitigation - Client Side Encoding, Blacklisting and Whitelisting inputs

The video tutorial covers client-side encoding mechanisms in JavaScript, highlighting built-in methods for automatic data encoding. It discusses the limitations of client-side encoding, such as the potential for malicious script injection. The tutorial contrasts blacklisting and whitelisting as input validation strategies, emphasizing the complexity of blacklisting due to evolving suspicious patterns. Whitelisting is presented as a simpler, more effective approach, focusing on allowing only specific patterns. The video concludes with a discussion on handling suspicious input, recommending rejection over sanitization for safety.

What are the built-in methods in JavaScript that help in encoding user input?

Explain the concept of blacklisting in input validation.

What are the limitations of using blacklisting as a strategy for input validation?

Describe the whitelisting approach in input validation.

Why is whitelisting generally preferred over blacklisting?

What should be done when input contains suspicious characters?

Discuss the importance of rejecting input rather than sanitizing it.