| Antivirus | Description |
|---|---|
| Windows Defender | Built-in AV for Windows |
| ClamAV | Open-source AV for Linux/macOS |
| sudo freshclam | Update ClamAV signatures |
| sudo clamscan -r /home | Scan directory recursively |
| Firewall | Description |
|---|---|
| netsh advfirewall | Windows firewall CLI |
| ufw enable | Enable firewall (Linux) |
| ufw allow 443 | Allow HTTPS traffic |
| pfctl | macOS firewall control |
| Encryption | Description |
|---|---|
| BitLocker | Drive encryption (Windows) |
| FileVault | macOS disk encryption |
| LUKS | Linux disk encryption |
| gpg --encrypt | Encrypt files with GPG |
| MFA & Access | Description |
|---|---|
| Microsoft Authenticator | MFA app for Windows login |
| Google Authenticator | MFA app for Linux/macOS |
| ssh-keygen | Generate SSH key pair |
| chmod 600 ~/.ssh/id_rsa | Secure private key |