Yubico - YubiKey 4 - USB-A, Two-Factor Authentication Protect online accounts against unauthorized access by using two factor authentication with this security key. Works with Gmail, Facebook, Dropbox, Twitter, Dashlane, LastPass and hundreds of other services Durable, waterproof, and crush resistant Fits USB-A computer ports and designed to fit on your keychain Multi-protocol support: FIDO U2F, Yubico OTP, OATH-TOTP, OATH-HOTP, Smart card (PIV), OpenPGP, Challenge-Response; Made in USA Strong two-factor hardware based authentication Easy and fast authentication with a single touch Reduces IT operational costs Multi-protocol support on a single key Crush-resistant and waterproof Made in the USA Supported protocols: FIDO U2F, smart card (PIV), Yubico OTP, OpenPGP, OATH-TOTP, OATH-HOTP, and Challenge-Response Secure element hardware to protect cryptographic keys Crypto Algorithms: RSA 2048, ECC p256, ECC p384 Interface: USB-A Works on Microsoft Windows, Mac OS X, Linux, Chrome OS operating systems, and on major browsers Now works with Twitter! PIV smart card compatible, minidriver available on Windows Support for PKCS#1