Security Skills

Overview

Security knowledge essential for building secure applications, protecting user data, and preventing common vulnerabilities.

Security Layers

┌─────────────────────────────────────────────┐
│              Application Security            │
│  ┌─────────────────────────────────────────┐│
│  │         Authentication & AuthZ          ││
│  │  ┌───────────────────────────────────┐  ││
│  │  │        Input Validation           │  ││
│  │  │  ┌─────────────────────────────┐  │  ││
│  │  │  │    Data Protection          │  │  ││
│  │  │  └─────────────────────────────┘  │  ││
│  │  └───────────────────────────────────┘  ││
│  └─────────────────────────────────────────┘│
│              Infrastructure Security         │
└─────────────────────────────────────────────┘

Categories

Authentication

• JWT tokens and refresh strategies
• OAuth 2.0 / OpenID Connect
• Session management
• Multi-factor authentication
• Passwordless authentication

Authorization

• Role-Based Access Control (RBAC)
• Attribute-Based Access Control (ABAC)
• Permission systems
• Access control patterns

OWASP Top 10

• Injection attacks
• Broken authentication
• Cross-Site Scripting (XSS)
• Cross-Site Request Forgery (CSRF)
• Security misconfiguration
• Sensitive data exposure

API Security

• Rate limiting
• Input validation
• API key management
• CORS configuration

Data Protection

• Encryption at rest/transit
• Password hashing
• Secrets management
• Data masking/anonymization

Infrastructure

• HTTPS/TLS configuration
• Security headers
• Container security
• Network security

Compliance

• GDPR requirements
• PCI-DSS standards
• Security auditing

Security Mindset

"Security is not a product, but a process." - Bruce Schneier

Always assume:

• All input is malicious
• External systems can be compromised
• Attackers will find vulnerabilities
• Defense in depth is essential

Quick Reference

Threat	Primary Defense	Secondary Defense
SQL Injection	Parameterized queries	Input validation
XSS	Output encoding	CSP headers
CSRF	CSRF tokens	SameSite cookies
Auth bypass	Strong authentication	Session management
Data breach	Encryption	Access control

Related Skills

• API Design - Secure API patterns
• Testing - Security testing
• Architecture - Security architecture