The YubiKey 5 NFC has six distinct applications, which are all independent of each other and can be used simultaneously. Note: Some software such as GPG can lock the CCID USB interface, preventing another software from accessing applications that use that mode.

Interface

The YubiKey 5 NFC uses a USB 2.0 interface as well as an NFC interface. All of the applications are available through both interfaces.

Applications

FIDO2

The FIDO2 application allows for secure single and multi-factor authentication, and can store up to 25 resident 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 is FIDO certified.

USB Interface: FIDO

More about FIDO 2

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 5 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.

Default Values:

PIN: 123456
PUK: 12345678
Management Key: 010203040506070801020304050607080102030405060708

Supported Algorithms:

RSA 1024
RSA 2048
ECC P256
ECC P384

Slot Information:

Slot 9a: Authentication
Slot 9b: Management Key
Slot 9c: Digital Signature
Slot 9d: Key Management
Slot 9e: Card Authentication
Slot f9: Attestation
Slots 82-95: Retired Key Management

USB Interface: CCID

More info about PIV

OpenPGP

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

Supported Algorithms:

RSA 1024
RSA 2048
RSA 3072
RSA 4096

Additional Supported Algorithms (firmware 5.2.3 and higher):

secp256r1
secp256k1
secp384r1
secp521r1
brainpoolP256r1
brainpoolP384r1
brainpoolP512r1
curve25519
- x25519 (decipher only)
- ed25519 (sign / auth only)

USB Interface: CCID

Physical Specifications

Form Factor

Connector: USB-A
Dimensions: 18mm x 45mm x 3.3mm
Weight: 3g

Temperatures

Operational range: 0 °C to 40 °C (32 °F to 104 °F)
Storage range: -20 °C to 85 °C (-4 °F to 185 °F)

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