u2f-zero: U2F USB token optimized for physical security, affordability, and style Tips and Tricks u2f-zero: U2F USB token optimized for physical security, affordability, and style do son September 29, 2017 U2F Zero U2F Zero is an open source U2F token for 2-factor authentication. It is implemented securely.... Read More Read more about u2f-zero: U2F USB token optimized for physical security, affordability, and style