FAQ
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General
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series has 5 PINs.
FIDO x1
PIV x2
GPG x2
series has 1 PIN.
FIDO x1
Used for signing into websites like Google / Microsoft or Windows Hello. This pin will also be asked for if you associate your Yubikey with Bitwarden using FIDO2 or Webauthn. If you own a blue Yubikey, then this is the ONLY PIN you will have and you can skip the other definitions below.
USER PIN and PUK PIN These pins are used when you do tasks such as signing code, importing new PIV certificate onto your Yubikey, or unlock a Bitlocker encrypted drive with a PIV slot.
The PUK PIN is only asked for if you lock yourself out with too many incorrectly provided USER PIN attempts.
PIV also includes x1 management key.
USER PIN and ADMIN PIN These pins are used when you use programs like Gpg4win / gpg or the gpg command-line for actions such as encrypting files, signing files, decrypting files or when you generate new gpg keys on your Yubikey.
GPG also includes x1 reset code.
NFC stands for Near-field communication
FIPS stands for Federal Information Processing Standards
series devices allow you to tap your Yubikey against the back of a phone that is NFC capable, or an . This enables your device to communicate / authorize your Yubikey without the need for plugging the Yubikey physically into a USB port.
(Think of it as short-range bluetooth).
series contains the same functionality as the 5 NFC, including the NFC wireless functionality; however, the FIPS series is and is geared toward government contractors / employees that can only use FIPS certified devices at their workplace. They are also DoD and NSA-approved alternate authenticators.
Note: Early versions of FIPS series Yubikeys did not support OpenPGP / GPG. However, as of v5.4.3, the FIPS series now supports OpenPGP / GPG.
. If you have an older Yubikey FIPS device and wish to have OpenPGP support, you must purchase a newer Yubikey 5 FIPS device from .
In short, unless you are a government employee / contractor, and your job specifically mentions the need for a FIPS certified device, you should just purchase a Yubikey 5 NFC.
Firmware is a type of software that provides low-level control for a device's specific hardware. It determines what features the device has.
Unfortunately, . If you have an older device and wish to get the latest firmware, you will need to purchase a separate Yubikey that has been manufacturered more recently.
At the time of writing this, firmware v5.4.3 is available (1/31/2023)
For information on checking your firmware version, read our Yubikey .
If spare funds allow for it, yes.
Some websites will automatically request you do sign in using your Yubikey once you have linked one (such as Cloudflare). If your only Yubikey is broken, you will be unable to sign in to your account which makes for a tragic situation.
It's always recommended to buy at least two.
No. These are two separate interfaces on your Yubikey. You can however use both technologies for similar things. For example, you can set up SSH to use either PIV or GPG to authenticate with a server.
Two different technologies, but certain tasks can be done by both.
.
No. PIV and GPG are two separate interfaces. Changing your PIV PINs does not change your GPG PINs and vice versa.
Bitlocker uses the Yubikey PIV interface. It looks for a certificate in one of your 4 main PIV slots. (9A, 9C, 9D, 9E)
In order to have a usable certificate for Bitlocker, you must ensure your certificate is assigned the following OIDs:
keyEncipherment # Key Encipherment (20)1.3.6.1.4.1.311.67.1.1 # Bitlocker Drive Encryption
1.3.6.1.4.1.311.67.1.2 # Bitlocker Data Recovery AgentBitlocker allows you to encrypt and lock an entire drive.
EFS allows you to encrypt and lock particular files/folders.
You can use PIV slot 9A OR you can use a GPG key Both can work depending on your desired configuration needs.
When you press the button in the middle of the Yubikey, it will perform whatever you have programmed that slot to do, such as entering static passwords, challenge response codes, etc. To stop the Yubikey from automatically sending the "enter" command, type the following in console:
ykman otp settings 1 --no-enter
ykman otp settings 2 --no-enterYou must have the Yubikey Manager / ykman installed to run this command.
Yes. KeePassXC specifically looks for a challenge response on slot 2.
Yes. These PINs are how your PIV interface is managed. If lose your Yubikey and someone else finds it, they can use all the defaults and utilize the PIV keys you have stored as if they were you.
Even if you don't plan on using the PIV interface, it's a good idea to chage them.
For instructions on setting this up, read our .
