Resources & Documentation
Yubikey 5C
Technical specifications
Interface
The Yubikey 5C uses a USB-C 2.0 interface. All applications are available on this interface
OTP
The OTP applet contains 2 programmable slots, each of which can store the following types of identifier:
- Yubico OTP
- HMAC-SHA1 Challenge-Response
- Static password
- OATH-HOTP
OATH
The Yubikey 5 series can store up to 32 OATH identifiers (supports OATH-TOTP and OATH-HOTP). To access this applet, you need the 'Yubico Authenticator' application.
Open PGP
NB: From yubikey firmware 5.2.3 onwards, version 3.4 of the Open PGP specifications is implemented. For key sizes above 2048 bits, GnuPG version 2.0 or higher is required.
Supported algorithms:
RSA 1024
RSA 2048
RSA 3072
RSA 4096
Additional algorithms (firmware 5.2.3 and higher):
secp256r1
secp256k1
secp384r1
secp521r1
brainpoolP256r1
brainpoolP384r1
brainpoolP512r1
curve25519
x25519 (decryption only)
ed25519 (sign / auth only)
FIDO 2
The FIDO 2 application enables single and multi-factor secure authentication, and can store 25 sets of credentials.
These credentials, which are protected by a PIN code, enable password-free authentication.
The Yubikey, unlocked by its PIN code and pressed manually, enables you to log in to your accounts without entering a username or password.The FIDO2 application is FIDO certified.
U2F
The U2F application can hold an unlimited number of U2F identifiers, and is FIDO-certified.
PIV (Smart card)
This application provides a PIV-compatible smart card. Under Windows, smart card functionality can be enhanced by using the 'Yubikey Smat Card' minidriver.
Default values:
PIN: 123456
PUK: 12345678
Management Key: 010203040506070801020304050607080102030405060708
Supported algorithms:
RSA 1024
RSA 2048
ECC P256
ECC P384
Informations Slots:
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
Physical specifications
Form factor:
Connector: USB-C
Dimensions: 12.2mm x 29.1mm x 4.8mm
Weight: 2g
Temperatures:
Operating thresholds: 0 °C to 40 °C
Storage thresholds: -20 °C to 85 °C