YubiKey 4 pentru 2FA compatibila cu Google / GitHub / Windows / VPN / etc. Se conecteaza pe USB-A si suporta protocol U2F, OATH, OTP, OpenPGP, FIDO 1 (fara FIDO 2), a se vedea mai jos lista completa:

OTP
The OTP applet contains two programmable slots, each can hold one of the following credentials:

Yubico OTP
HMAC-SHA1 Challenge-Response
Static Password
OATH-HOTP
USB Interface: OTP

U2F
The U2F application can hold an unlimited number of U2F credentials and is FIDO certified.

USB Interface: FIDO

OATH
The YubiKey 4 series can hold up to 32 OATH credentials and supports both OATH-TOTP (time based) and OATH-HOTP (counter based). Accessing this applet requires Yubico Authenticator.

USB Interface: CCID

PIV (Smart Card)
This application provides a PIV compatible smart card. On Windows, the smart card functionality can be enhanced with the YubiKey Smart Card Minidriver.

Supported Algorithms:

RSA 1024
RSA 2048
ECC P256
ECC P384
USB Interface: CCID

OpenPGP
This application implements version 2.0 of the OpenPGP Smart Card specification which can be used with GnuPG. For key sizes over 2048 bits, GnuPG version 2.0 or higher is required.

Supported Algorithms:

RSA 1024
RSA 2048
RSA 3072
RSA 4096