Security Fundamentals
Authentication
Authentication is the first line of defense for system access. Always use strong passwords and enable multi-factor authentication (MFA).
sudo passwd new-username
Encryption
Secure your communications and data at rest using strong encryption methods. Use AES-256 for data storage and TLS for network communication.
openssl genrsa -out private.pem 2048
Firewall Configuration
Implement proper network security with firewalls to control incoming and outgoing traffic. Consider using nftables or uptables.
nft add table ip filter
Security Auditing
Regularly audit your systems using tools like Lynis or OpenSCAP to ensure compliance and detect vulnerabilities.
lynis --quick-check
Security Tips
- Keep your system updated
- Use strong, unique passwords
- Enable account lockout policies
- Monitor system logs for suspicious activity
- Implement principle of least privilege