Yubico unveiled two new security keys CES as it makes its line work across more platforms. But a key geared specifically for Apple products won't reach consumers' hands quite yet.

All four devices in the fifth line of YubiKeys support FIDO2, an open authentication protocol that allows users to forgo passwords entirely.

YubiKeys will finally work with iPhones.

"Mobile devices have opened a profitable new window of opportunity for criminals executing phishing attacks," the researchers wrote.

Twitter users can upgrade in the settings and privacy section of their profiles.

Only 28 percent of Americans use two-factor authentication.