Device Security

Two-step verification for Apple ID

Two-step verification is an additional security feature for your Apple ID that's designed to prevent anyone from accessing or using your account, even if they know your password

1. Go to My Apple ID.
2. Click Manage your Apple ID and sign in.
3. Click Password and Security.
4. Answer your security questions and continue.
5. Under Two-Step Verification, select Get Started and follow the onscreen instructions.

More details: https://support.apple.com/en-us/HT204152

Firmware password on your Mac

Setting a firmware password in OS X prevents your Mac from starting up from any device other than your startup disk.
Note: Don't lose the Firware password!!

1. Shutdown your Mac.
2. Start up your Mac again and immediately hold Command + R to start from OS X recovery.
3. When the recovery window appears, choose Firmware Password Utility from the Utilities menu.
4. In the Firmware Utility window that appears, click Turn On Firmware Password.
5. Set new password.
6. Click Quit Firmware Utility and close the Firmware Password Utility.
7. Restart or shutdown.

More details: https://support.apple.com/en-us/HT204455

Remove CNNIC Certificates from Keychain

Open Keychain Access > search CNNIC > delete all associate certificates