FIDO Universal 2nd Factor
FIDO alliance U2F protocol is an emerging open authentication standard, with native support in platforms and browsers. U2F breaks the mold for high security public key authentication, removing the complexity of drivers, specialized client software, and the traditional costly CA model.
Yubico Hardware Security for IT
OpenPGP in hardware
The Private key from this example OpenPGP key pair is held in hardware on a Yubico NEO U2F security token.