Good variable naming can help keep track of the security condition of data to help avoid simple mistakes.
- It's important to keep track … of which data has been sanitized and which has not. … We can use variable names to label which data … is potentially dangerous and which data is safe to use. … Before sanitization we can use names … such as dirty, raw or unsafe. … After sanitization we can use names … such as clean, sanitized or safe. … Let me show you an example using PHP. … An email address is received from a webform … and assigned to the variable raw_email. … The prefix raw makes it obvious … that it has not been sanitized. … After the value passes through a sanitize function … it's assigned to a new variable, safe_email. … The prefix safe makes it clear … the data has now been sanitized. … Of course it can also be done as a one step process … without using the variable raw_email, … but still the variable name indicates … that it has been sanitized. … Here's another example using Ruby on Rails. … An empty hash is assigned to the variable dirty_params. … Several request parameters are added to it. …
- Threat models
- Least privilege
- Defense in depth
- Validating and sanitizing input
- Credential attacks
- SQL injection
- Cross-site scripting
Skill Level Beginner
Web Programming Foundationswith Morten Rand-Hendriksen58m 44s Beginner
Web Security: Same-Origin Policieswith Sasha Vodnik1h 54m Advanced
1. Security Overview
2. General Security Principles
3. Filter Input, Control Output
4. The Most Common Attacks
Next steps2m 26s
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