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Yubico

Yubico YubiKey 4 - USB-A, Two-Factor Authentication

242 customer reviews

| 78 answered questions

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Two-factor authentication made easy for hundreds of services
Smart card (PIV), Yubico OTP, OATH-TOTP, OATH-HOTP, FIDO U2F, OpenPGP, Challenge-Response
USB Type A compatible
Extremely durable and rigid; crush and water resistant
Attaches to house and car keychain

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Product Description

Log In 4X Faster with YubiKey 4

The YubiKey 4 adds a second layer of protection to your accounts with multi-factor authentication to prevent unauthorized access. Slide the YubiKey 4 into your device's USB-A slot and tap the gold contact. It is that easy!

Product information

Technical Details

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Other Technical Details

Brand Name

Yubico

Item model number

YUBIKEY4

Item Weight

1.32 pounds

Product Dimensions

0.7 x 0.1 x 1.8 inches

Item Dimensions L x W x H

0.71 x 0.12 x 1.77 inches

Color

Black

Additional Information

ASIN

B018Y1Q71M

Customer Reviews

242 customer reviews

4.3 out of 5 stars

Best Sellers Rank

#55 in Computers & Accessories > Computer Accessories > USB Gadgets

Shipping Weight

0.64 ounces (View shipping rates and policies)

Date First Available

December 14, 2015

Warranty & Support

Amazon.com Return Policy:You may return any new computer purchased from Amazon.com that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. Amazon.com reserves the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned computer that is damaged through customer misuse, is missing parts, or is in unsellable condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. Amazon.com will not accept returns of any desktop or notebook computer more than 30 days after you receive the shipment. New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.

Product Warranty: For warranty information about this product, please click here

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Seller Warranty Description

1 year warranty on materials and workmanship.

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Customer Reviews

4.3 out of 5 stars

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JeffTop Contributor: Smart Home

Great device for secure two factor authentication - not for everyone

March 27, 2016

Verified Purchase

This is an excellent device and I strongly recommend it if you use a password manager that supports it (Last Pass, Dashlane, etc). The benefit of this device with a Password Manager is you can enable two factor authentication to add a new device capable of signing into your account. In short, it doesn't matter if someone knows you master password, they can't add a device (computer capable accessing your account) unless the have they have a Yubikey.

To add a phone or tablet that doesn't have a USB, use this device on a computer to temporarily disable the two factor Yubikey authentication, add your Device, then reable the key. I recommend getting a backup key or if your spouse or partner uses one, register both keys on each other's account. This will save headaches if the device is lost.

This security key has the ability to maintain two two security access methods, e.g., Smart Card and Fido U2F. Be aware this comes with no documentation at all! I mean none - while there is a lot of information on their website and on the Dashlane Password Manager website, you get the feeling that these products are aimed at a narrow group of IT savvy individuals or organizations with IT specialists to configure them for staff.

I hope this review is helpful!

158 people found this helpful

Get two if you are considering it.

January 17, 2016

Verified Purchase

I bought this to figure out how it worked. Its silly easy. Basically it can integrate with almost any authentication YOU own. As far as third party it can be made to work (easy) with anything that is always online. If your using it to authenticate to something offline it can do a challenge response and the configuration seems quite secure.

You already know its practically indestructible.

Love it, you probably don't need this newest nicest one, but I do strongly recommend getting two, and configuring them with your services at the same time, that way if the key is lost or stolen you don't have to jump through password recovery hoops.

91 people found this helpful

Would have bought something else it if I knew then what I know now

August 16, 2017

Verified Purchase

I bought it primarily for PGP encryption on Linux desktops. I bought this under the impression that this was more open source than it actually is. In the process of trying to get this to work and troubleshoot, I've come across information which may have led me to buy something like Nitrokey instead (not available on Amazon at this time).

I didn't know at the time of purchase, but a discussion on had Github caused a controversy. I find the company's attitude towards security troublesome. In a blog post, they respond to the controversy with excuses and push a security-through-obscurity narrative. They don't release specifications or emulators for their devices. Having code / firmware / blueprints secret makes end users less secure. They want users to trust them rather than their device earning trust on its demonstrable technical merit. They ask their customers to have faith that there are no bugs or backdoors that hackers or governments can exploit to steal their customers' keys.

Since Amazon reviews don't allow hyperlinks, I cannot cite sources but you can look this up yourself. Corporate ethics aside, here is my experience on Linux Mint (Ubuntu):

it took a while to set up correctly. The documentation was hit-or-miss. It does not work with Ubuntu 14.04 LTS, so I upgraded my system from Linux Mint 17 to 18 (based on Ubuntu 16.04 LTS). I've been using it with gpg2. I've spent a lot of time trying to track down a bug where the Yubikey will not reprompt for PIN after it is unlocked for the first time. I've spent a lot of time and tried many different steps to set a timeout. I've tried searching the web for help with this problem, but I've basically only come across users with the same unanswered question. Or they have a similar question and say they get it working but repeating their steps don't work for me. I'd be more comfortable if I could have my PIN required every time. At this time I don't know if the PIN is being cached by desktop software or the Yubikey.

46 people found this helpful

Amazon Customer

Good product and does what it's suppose to do

September 18, 2016

Verified Purchase

Good product and does what it's suppose to do. Setting it up to work as a PIV smart card is a pain, simply due to Certificate Authority issues with EFS/Bitlocker; however, easily remedied using command-line instead of their PIV Manager GUI.

Zero problems with U2F. Challenge-response with Windows Login is very, very easily bypassed, even with it enabled in Safe Mode, by simply creating a WinPE (Pre-installation Environment) bootable USB and modifying a registry string. When you have many of us who create custom, and universal, WinPE bootable USBs to aid in computer security issues, it's kind of a bummer to see how easy this is to disable. That said, it's still a decent way to prevent unauthorized access to your PC/laptop though there are much better ways to do it, and without using 3rd party programs (e.g. adding a signed CA giving it access to the EFS and adding Bitlocker's usage extension OID to the certificate). And if you plan to use self-signed certificates, make sure the first thing you do before even starting is head into your registry and change or add "SelfSignedCertificates" to a DWORD value of 1, though anyone who knows how to use SSH can easily get themselves a signed certificate without having an enterprise CA to request it from.

A lot of other encrypting programs can utilize this, too, like VeraCrypt. Honestly using this as a PIV smart-card really opens up the doors on what this can do as far as security, and with free utilities like VeraCrypt, not utilizing PIV features like certificate and token storage is just making this go to waste.

Also, buy 2 of these because a backup key is just logical considering you can program them identically.

Good little unit and really for $40, you can't beat everything it can do; however, their GUI tools really only show the average person about 30% of its actual abilities.

13 people found this helpful

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Most recent customer reviews

Must have for those who need extra security for their G-Mail!

Great security key! Must have for 2 Step Verifications!

Published 7 hours ago

THANK YOU YUBICO

Thanks 2 yubico and there keys my accounts are getting back to normal i really recomend these to anyone dealing with a hacker or whatever you want to call them i don't work for...Read more

Published 1 day ago

Steve D. Poling

Published 2 days ago

Functions well, but the thin-and-long profile makes it awkward ...

Functions well, but the thin-and-long profile makes it awkward to keep in a usb port. Always worried about hitting the thing accidentally and breaking it.YubiKey 4 Nano (or the newer USB-C equivalent) since it is smaller so harder to accidentally break.Read more

Published 5 days ago

Works great & HIGHLY recommend it!

Works as extra security! I use it with LastPass security for the extra step in securing my computer(s). I bought 1 for each of the computers & laptop.

Published 6 days ago

Richard Birchmire

Published 13 days ago

Amazon Customer

SECURE MY ACCOUNT IN FACEBOOK AND GMAIL

Published 1 month ago

Not as user friendly as it could be...be very customizable for techys

Published 1 month ago

Designed for Failure. Look at the USB connection tab.

The design is prone to failure due to the wafer style USB pads pictured. Since the drive tip is not full framed USB A, over time your USB port will not maintain enough pressure...Read more

Published 1 month ago

Feedback from my son was not positive.

Published 1 month ago

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