Security Best Practices

Core Principles

1. Defense in Depth - Multiple layers of security
2. Least Privilege - Minimal permissions needed
3. Fail Secure - Default to denial on errors
4. Input Validation - Trust nothing from outside
5. Secure by Default - Security shouldn't be optional

OWASP Top 10 (2021)

1. Broken Access Control

Problem: Users accessing data/functions they shouldn't.