In YubiKey firmware versions 5.2.3 and later, version 3.4 of the OpenPGP Smart Card spec is implemented instead (refer to this article for more details). This application implements version 2.0 of the OpenPGP Smart Card specification which can be used with GnuPG.

On Windows, the smart card functionality can be enhanced with the YubiKey Smart Card Minidriver. This application provides a PIV compatible smart card. Accessing this applet requires Yubico Authenticator. The YubiKey 5 series can hold up to 32 OATH credentials and supports both OATH-TOTP (time based) and OATH-HOTP (counter based). The U2F application can hold an unlimited number of U2F credentials and is FIDO certified. The OTP applet contains two programmable slots, each can hold one of the following credentials: These credentials, which are protected by a PIN, enable passwordless login, where the YubiKey, unlocked by a PIN and authorized by touch, can log you in to your accounts without entering a username or password. The FIDO2 application allows for secure single and multi-factor authentication, and can store up to 25 resident credentials. All of the applications are available through both interfaces. The YubiKey 5 NFC uses a USB 2.0 interface as well as an NFC interface. Note: Some software such as GPG can lock the CCID USB interface, preventing another software from accessing applications that use that mode. The YubiKey 5 NFC has six distinct applications, which are all independent of each other and can be used simultaneously.

If you're looking for setup instructions for your YubiKey 5 NFC, see. Note: This article lists the technical specifications of the YubiKey 5 NFC.

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