Don wants to use a Yubikey to keep his computer safe online. Leo says that the Yubikey is serious two-factor authentication that enables users to generate a code to offer an extra level of security. It's a physical USB device that spits out a code with a one time password. Leo uses it for his email, Twitter, and a host of other sites online. He wishes his bank would support it. He keeps it on his keychain, using a Type C connector. But he can get a Type A adapter as well.
There's even an open source version called SOLOKEYS, which Leo says is every bit as good.