YubiKey 4C

The YubiKey 4C has five 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 4C uses a USB 2.0 interface. All of the applications are available through this interface.

Applications

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

USB Interface: CCID

Physical Specifications

Form Factor

Connector: USB-C
Dimensions: 12.5mm x 29.5mm x 5mm
Weight: 2g

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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