Input validation and sanitization in Cybersecurity - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is input validation?

Input validation is the process of checking if the data entered by a user meets the expected format, type, and rules before it is processed.

beginner

What does input sanitization mean?

Input sanitization means cleaning or modifying user input to remove or neutralize harmful parts, like special characters that could cause security problems.

intermediate

Why is input validation important in cybersecurity?

It helps prevent attacks like SQL injection or cross-site scripting by ensuring only safe and expected data is accepted.

beginner

Give an example of input sanitization.

Removing HTML tags from user comments to prevent scripts from running on a website.

intermediate

What is the difference between input validation and input sanitization?

Validation checks if input is correct and allowed; sanitization cleans input to make it safe. Both work together to protect systems.

What is the main goal of input validation?

A To delete all user input

B To store data without checking

C To speed up data processing

D To check if input data is in the correct format

Input validation ensures data is in the expected format before processing.

Which of the following is an example of input sanitization?

A Removing script tags from a text input

B Ignoring user input

C Allowing any characters in a username

D Checking if a phone number has 10 digits

Removing script tags cleans input to prevent harmful code execution.

Why is input sanitization important?

A To prevent security attacks like cross-site scripting

B To make input look nicer

C To increase server speed

D To allow all inputs without checks

Sanitization removes dangerous parts of input to protect against attacks.

Which attack can input validation help prevent?

A Phishing emails

B SQL injection

C Denial of service

D Password guessing

Validating input can block malicious SQL commands from being executed.

What should you do if user input fails validation?

A Accept it anyway

B Ignore the input

C Reject it and ask for correct input

D Store it without changes

Rejecting invalid input helps keep data safe and consistent.

Explain in your own words what input validation and input sanitization are and why they are important.

Think about how checking and cleaning user data helps keep systems safe.

Describe a real-life example where input validation and sanitization can protect a website.

Imagine a comment box on a blog or social media site.