Enabling secure sign-in in Windows 8 and 8.1 will require users to press Ctrl+Alt+Del to get to login screen.
To enable secure sign-in, search for “netplwiz” from start screen.
When User Accounts screen opens, click on Advanced tab. Under Secure sign-in section, check “Require users to press Ctrl+Alt+Delete” option.
Click OK to close User Accounts screen. Next time you are logging into your computer, you will be prompted to press Ctrl+Alt+Del first.