Using Security Key for 2-Step Verification - Accounts Help. We have spoken before about Internet security. If you use any websites that require confidential information, it is important the you use something more serious than simple password protection. Even if you use a strong password, which mixes letters, numbers, and special characters in a string with a minimum of 12 characters, you aren't doing all that you should. Two step authentication requires both something you know (your password), and something you have (your smartphone to receive an authentication code). However, you can upgrade two step authentication by substituting a USB key for the second step. USB keys use encryption, and Chrome supports keys using the FIDO U2F specification. They are cheap: mine cost $6 on Amazon. Be safe out there.