2 and later supports HMAC-SHA1 or Yubico challenge-response operations. (Edit: also tested with newest version April 2022) Note While the original KeePass and KeePassXC use the same database format, they implement the challenge-response mode differently. 2, there is . /klas. Configure a static password. Test your backup ways in, all of them, before committing important data to your vault, and always remember to keep a separate backup (which itself can be encrypted with just a complex password). Using keepassdx 3. 4. HMAC-SHA1 Challenge-Response. Scan yubikey but fails. enter. You can also use the tool to check the type and firmware of a YubiKey, or to perform batch programming of a large number of YubiKeys. The mechanism works by submitting the database master seed as a challenge to the YubiKey which replies with a HMAC-SHA1. 3. Ensure that the challenge is set to fixed 64 byte (the Yubikey does some odd formatting games when a variable length is used, so that's unsupported at the moment). SmartCardInterface - Provides low level access to the Yubikey with which you can send custom APDUs to the key. My Configuration was 3 OTPs with look-ahead count = 0. Select the password and copy it to the clipboard. Although it doesn't affect FIDO directly, there is what I would consider a de-facto standard procedure with challenge-response procedures for the Yubikey,. ykDroid is a USB and NFC driver for Android that exposes the. 3 (USB-A). The HOTP and Yubico-OTP protocols are similar to challenge-response, except that the Yubikey generates the challenge itself rather than accepting one from the system it is authenticating to; the challenge is simply an incrementing integer (ie a counter) stored on the Yubikey and thus no client software is needed. Authenticate using programs such as Microsoft Authenticator or. In addition to FIDO2, the YubiKey 5 series supports: FIDO U2F, PIV (smart card), OpenPGP, Yubico OTP, OATH-TOTP, OATH-HOTP, and challenge-response. Download. The YubiKey computes HMAC-SHA1 on the Challenge using a 20 byte shared secret that is programmed into the YubiKey and the calculated digest i. This includes all YubiKey 4 and 5 series devices, as well as YubiKey NEO and YubiKey NFC. AppImage version works fine. serial-usb-visible: The YubiKey will indicate its serial number in the USB iSerial field. I use KeepassXC as my TOTP and I secure KeepassXC with Yubikey's challenge response. Check Key file / provider: and select Yubikey challenge-response from drop-down. KeePass natively supports only the Static Password function. Generate One-time passwords (OTP) - Yubico's AES based standard. Also if I test the yubikey in the configuration app I can see that if I click. Using. install software for the YubiKey, configure the YubiKey for the Challenge-Response mode, store the password for YubiKey Login and the Challenge-Response secret in dom0, enable YubiKey authentication for every service you want to use it for. All three modes need to be checked: And now apps are available. Ensure that the challenge is set to fixed 64 byte (the Yubikey does some odd formatting games when a variable length is used, so that's unsupported at the moment). This does not work with remote logins via. node file; no. For challenge-response, the YubiKey will send the static text or URI with nothing after. Posts: 9. Manage certificates and PINs for the PIV ApplicationThe Yubico OTP is 44 ModHex characters in length. What I do personally is use Yubikey alongside KeepassXC. If the Yubikey is plugged in, the sufficient condition is met and the authentication succeeds. The U2F device has a private key k priv and the RP is given the corresponding public key k pub. There are two Challenge-Response algorithms: HMAC-SHA1; Yubico OTP; You can set them up with a GUI using the yubikey-personalization-gui, or with the following instructions: HMAC-SHA1 algorithm. Otherwise loosing HW token would render your vault inaccessible. Enter ykman otp info to check both configuration slots. I transferred the KeePass. YubiKey Personalization Tool shows whether your YubiKey supports challenge-response in the lower right. Use "client" for online validation with a YubiKey validation service such as the YubiCloud, or use "challenge-response" for offline validation using YubiKeys with HMAC-SHA-1 Challenge-Response configurations. The YubiKey can be configured with two different C/R modes — the standard one is a 160 bits HMAC-SHA1, and the other is a YubiKey OTP mimicking mode, meaning two subsequent calls with the same challenge will result in different responses. Note: We did not discuss TPM (Trusted Platform Module) in the section. It will be concatenated with the challenge and used as your LUKS encrypted volume passphrase for a total length of 104 (64+40) bytes. I confirmed this using the Yubico configuration tool: when configured for a fixed length challenge my yubikey does NOT generate the NIST response, but it does if I set it to variable length. However, various plugins extend support to Challenge Response and HOTP. Commands. This means the same device that you use to protect your Microsoft account can be used to protect your password manager, social media accounts, and your logins to hundreds of services. Update: Feel like a bit of a dope for not checking earlier, but if you go to the KeePassXC menu, then click About KeePassXC, at the bottom of the resulting window it lists "Extensions". Configuring the OTP application. Advantages of U2F include: A Yubikey response may be generated in a straightforward manner with HMAC-SHA1 and the Yubikey's secret key, but generating the Password Safe Yubikey response is a bit more involved because of null characters and operating system incompatibilities. Configure a slot to be used over NDEF (NFC). (Edit: also tested with newest version April 2022) Note While the original KeePass and KeePassXC use the same database format, they implement the challenge-response mode differently. debug Turns on debugging to STDOUT mode=[client|challenge-response] Set the mode of operation, client for OTP validation and challenge-response for challenge-response validation, client is the default. Joined: Wed Mar 15, 2017 9:15 am. The U2F application can hold an unlimited number of U2F credentials and is FIDO certified. We start out with a simple challenge-response authentication flow, based on public-key cryptography. To use the YubiKey for multi-factor authentication you need to. Multi-factor authentication (MFA) can greatly enhance security while delivering a positive user experience. Compared to a usb stick with a code on it, challenge response is better in that the code never leaves the yubikey. Perform a challenge-response style operation using either YubicoOTP or HMAC-SHA1 against a configured YubiKey slot. Key driver app properly asks for yubikey; Database opens. Set a password. When you unlock the database: KeeChallenge sends the. Next we need to create a place to store your challenge response files, secure those files, and finally create the stored challenge files:Databases created with KeepassXC and secured with password and Yubikey Challenge Response don't trigger the yubichallenge app. Plug in the primary YubiKey. Now on Android, I use Keepass2Android. Please be aware that the current limitation is only for the physical connection. Important: Always make a copy of the secret that is programmed into your YubiKey while you configure it for HMAC-SHA1 and store it in a secure location. Each operates differently. The challenge is stored to be issued on the next login and the response is used as an AES256 key to encrypt the secret. Things to do: Add GUI Signals for letting users know when enter the Yubikey Rebased 2FA code by Kyle Manna #119 (diff);. Features. 4. The tool works with any YubiKey (except the Security Key). Remove your YubiKey and plug it into the USB port. x (besides deprecated functions in YubiKey 1. Expand user menu Open settings menu Open settings menuWhat is YubiKey challenge response? The YubiKey supports two methods for Challenge-Response: HMAC-SHA1 and Yubico OTP. Setting the challenge response credential. Operating system: Ubuntu Core 18 (Ubuntu. OATH-HOTP usability improvements. Accessing this application requires Yubico Authenticator. This makes challenge questions individually less secure than strong passwords, which can be completely free-form. The tool works with any YubiKey (except the Security Key). (For my test, I placed them in a Dropbox folder and opened the . The main issue stems from the fact that the verifiableFactors solely include the authenticator ID but not the credential ID. Send a challenge to a YubiKey, and read the response. What is important this is snap version. Need help: YubiKey 5 NFC + KeePass2Android. Yubikey is working well in offline environment. YubiKey slot 2 is properly configured for HMAC-SHA1 challenge-response with YubiKey Personalization Tool. Your Yubikey secret is used as the key to encrypt the database. I clicked “Add Additional Protection”, double-checked that my OnlyKey was open in the OnlyKey App, and clicked “Add Yubikey Challenge-Response”. J-Jamet mentioned this issue Jun 10, 2022. Challenge-response authentication is automatically initiated via an API call. I sit in the same Boat atm…i got a keepassxc file that needs a yubikey with hmac-sha1 challenge response. Perform a challenge-response operation. Click Challenge-Response 3. PORTABLE PROTECTION – Extremely durable, waterproof, tamper resistant,Because both physical keys use the same challenge-response secret, they should both work without issue. No Two-Factor-Authentication required, while it is set up. devices. Click Challenge-Response 3. How ever many you want! As normal keys, it be best practice to have at least 2. 3 to 3. Among the top highlights of this release are. Existing yubikey challenge-response and keyfiles will be untouched. {"payload":{"allShortcutsEnabled":false,"fileTree":{"Yubico. Configuration of FreeRADIUS server to support PAM authentication. CLA INS P1 P2 Lc Data; 0x00: 0x01 (See below) 0x00 (varies) Challenge data: P1: Slot. Remove the YubiKey challenge-response after clicking the button. Click OK. If the Yubikey is not plugged then the sufficient condition fails and the rest of the file is executed. Any key may be used as part of the password (including uppercase letters or other modified characters). Insert the YubiKey and press its button. HMAC-SHA1 Challenge-Response; Static Password; OATH-HOTP; USB Interface: OTP. This design provides several advantages including: Virtually all mainstream operating systems have built-in USB keyboard support. Yubikey Personalization Tool). 5 Debugging mode is disabled. To allow the YubiKey to be compatible across multiple hardware platforms and operating systems, the YubiKey appears as a USB keyboard to the operating system. g. Open up the Yubikey NEO Manager, insert a YubiKey and hit Change Connection Mode. MULTI-PROTOCOL SUPPORT: The YubiKey USB authenticator includes NFC and has multi-protocol support including FIDO2, FIDO U2F, Yubico OTP, OATH-TOTP, OATH-HOTP, Smart card (PIV), OpenPGP, and Challenge-Response capability to give you strong hardware-based authentication. I love that the Challenge-Response feature gives me a secret key to backup my hardware key and being able to freely make spares is a godsend for use with KeepassXC, but. Each instance of a YubiKey object has an associated driver. initialization: add a secret to the Yubikey (HMAC-SHA1 Challenge-Response) factor one is the challenge you need to enter manually during boot (it gets sha256sumed before sending it to the Yubikey) the second factor is the response calculated by the Yubikey ; challenge and response are concatenated and added as a password to a luks key slot. I tried configuring the YubiKey for OTP challenge-response, same problem. YubiKey SDKs. Click Challenge-Response 3. 1 Introduction This guide covers how to secure a local Linux login using the HMAC-SHA1 Challenge-Response feature on YubiKeys. e. Apps supporting it include e. USB/NFC Interface: CCID PIV. Update the settings for a slot. U2F. In this example we’ll use the YubiKey Personalization Tool on Mac, but the steps will be very similar on other platforms. 0), and I cannot reopen the database without my YubiKey, that is still only possible with YubiKey. YubiKey Manager. 0 from the DMG, it only lists "Autotype". There are a number of YubiKey functions. 2+) is shown with ‘ykpersonalize -v’. ykpass . The YubiKey 5Ci is like the 5 NFC, but for Apple fanboys. 4. Extended Support via SDK. The SDK is designed to enable developers to accomplish common YubiKey OTP application configuration tasks: Program a slot with a Yubico OTP credential; Program a slot with a static password; Program a slot with a challenge-response credential; Calculate a response code for a challenge-response credential; Delete a slot’s configuration 3 Configuring the YubiKey. Program a challenge-response credential. serial-usb-visible: The YubiKey will indicate its serial number in the USB iSerial field. Misc. Additionally, KeeChallenge encrypts the S with the pre-calculated challenge-response pair, and stored the encrypted secret and challenge in the XML file. I've tried windows, firefox, edge. . Open Yubikey Manager, and select Applications -> OTP. Strong security frees organizations up to become more innovative. KeeChallenge has not been updated since 2016 and we are not sure about what kind of support is offered. Commands. When inserted into a USB slot of your computer, pressing the button causes the. The first 12 characters of a Yubico OTP string represent the public ID of the YubiKey that generated the OTP--this ID remains constant across all OTPs generated by that individual key. Note. I followed a well-written post: Securing Keepass with a Second Factor – Kahu Security but made a. FIDO2, FIDO U2F, smart card (PIV), Yubico OTP, OpenPGP, OATH-TOTP, OATH-HOTP, and Challenge-Response” [1] So one key can do all of those things. yubico-pam: This module is for HMAC challenge-response and maybe more stuff (I didn’t look in detail into it) pam-u2f: This module is the official Yubico module for U2F, FIDO, FIDO2. The reason I use Yubikey HMAC-SHA1 Challenge Response is because it works by plugging it into my PC to access KeePass and also as NFC on my phone to access KeePass. For challenge-response, the YubiKey will send the static text or URI with nothing after. Manage certificates and PINs for the PIV application; Swap the credentials between two configured. Management - Provides ability to enable or disable available application on YubiKey. When I changed the Database Format to KDBX 4. NET SDK and the YubiKey support the following encryption and hashing algorithms for challenge-response: Yubico OTP (encryption) HMAC SHA1 as defined in RFC2104 (hashing) For Yubico OTP challenge-response, the key will receive a 6-byte challenge. moulip Post subject: Re: [HOW TO] - Yubikey SSH login via PAM module. But to understand why the system is as it is, we first have to consider what constraints and security considerations apply. I would recommend with a password obviously. Yubico OTP takes a challenge and returns a Yubico OTP code based on it encrypted. Both. In my experience you can not use YubiChallenge with Keepass2Android - it clashes with its internal Yubikey Neo support, each stealing the NFC focus from the other. YubiKey challenge-response for node. So yes, the verifier needs to know the. Perform a challenge-response operation. Edit: I installed ykdroid and an option for keepassxc database challenge-response presented itself. These features are listed below. KeePassXC offers SSH agent support, a similar feature is also available for KeePass using the KeeAgent plugin. 40, the database just would not work with Keepass2Android and ykDroid. (If queried whether you're sure if you want to use an empty master password, press Yes. Note that Yubikey sells both TOTP and U2F devices. devices. (Verify with 'ykman otp info') Repeat both or only the last step if you have a backup key (strongly recommended). This does not work with. The YubiKey PBA in NixOS currently features two-factor authentication using a (secret) user passphrase and a YubiKey in challenge-response mode. The component is not intended as a “stand-alone” utility kit and the provided sample code is provided as boilerplate code only. The YubiKey 5 Cryptographic Module (the module) is a single-chip module validated at FIPS 140-2 Security Level 1. 3: Install ykman (part of yubikey-manager) $ sudo apt-get install yubikey-manager. This is why a yubikey will often type gibberish into text fields with a user accidentally knocks the side of their token. Insert your YubiKey into a USB port. It does not light up when I press the button. Challenge-response. I suspect that the yubico personalization tool always sends a 64 byte buffer to the yubikey. Perform YubiOTP challenge response with AES 128 bit key stored in slot using user supplied challenge X WX – DRBG State X – OTP Key PERFORM HMAC-Support yubikey challenge response #8. Click Applications. NET SDK and the YubiKey support the following encryption and hashing algorithms for challenge-response: 1. The OTP appears in the Yubico OTP field. See examples/configure_nist_test_key for an example. YUBIKEY_CHALLENGE="enrolled-challenge-password" Leave this empty, if you want to do 2FA -- i. Available YubiKey firmware 2. I use KeepassXC as my TOTP and I secure KeepassXC with Yubikey's challenge response. This sets up the Yubikey configuration slot 2 with a Challenge Response using the HMAC-SHA1 algorithm, even with less than 64 characters. The YubiKey is given your password as a Challenge, where it performs some processing using the Challenge and the secret it has, providing the Response back to ATBU. The YubiKey can be configured with two different C/R modes — the standard one is a 160 bits HMAC-SHA1, and the other is a YubiKey OTP mimicking mode, meaning two subsequent calls with the same challenge will result in different responses. Also, I recommend you use yubkiey's challenge-response feature along with KeepassXC. MFA is an authentication method in which a computer user is granted access only after successfully presenting two or more pieces of evidence, or factors, to an authentication mechanism. Insert your YubiKey. 1 Inserting the YubiKey for the first time (Windows XP) 15. This creates a file in ~/. FIDO2 standard now includes hmac-secret extension, which provides similar functionality, but implemented in a standard way. Use "client" for online validation with a YubiKey validation service such as the YubiCloud, or use "challenge-response" for offline validation using YubiKeys with HMAC-SHA-1. In this mode of authentication a secret is configured on the YubiKey. Alternatively, activate challenge-response in slot 2 and register with your user account. If the Yubikey is plugged in, the sufficient condition is met and the authentication succeeds. This guide covers how to secure a local Linux login using the HMAC-SHA1 Challenge-Response feature on YubiKeys. First, configure your Yubikey to use HMAC-SHA1 in slot 2. I think. KeePassXC offers SSH agent support, a similar feature is also available for KeePass. Perform a challenge-response style operation using either YubicoOTP or HMAC-SHA1 against a configured YubiKey slot. Posts: 9. The YubiKey OTP application provides two programmable slots that can each hold one credential of the following types: Yubico OTP, static password, HMAC-SHA1 challenge response, or OATH-HOTP. Challenge/Response Secret: This item. 2. The YubiKey personalization tool allows someone to configure a YubiKey for HOTP, challenge response, and a variety of other authentication formats. ykDroid provides an Intent called net. Is a lost phone any worse than a lost yubikey? Maybe not. Context. The size of the the response buffer is 20 bytes, this is inherent to SHA1 but can by changed by defining RESP_BUF_SIZE. . However, challenge-response configurations can be programmed to require a user to touch the YubiKey in order to validate user presence. HMAC Challenge/Response - spits out a value if you have access to the right key. 4, released in March 2021. It does so by using the challenge-response mode. Display general status of the YubiKey OTP slots. To set up the challenge-response mode, we first need to install the Yubikey manager tool called ykman. Program an HMAC-SHA1 OATH-HOTP credential. To grant the YubiKey Personalization Tool this permission:Type password. 1. YubiKey/docs/users-manual/application-otp":{"items":[{"name":"application-concepts-overview. First, program a YubiKey for challenge response on Slot 2: ykpersonalize -2 -ochal-resp -ochal-hmac -ohmac-lt64 -oserial-api-visible. It will become a static password if you use single phrase (Master Password). Configure a static password. OATH. HMAC-SHA1 Challenge-Response* PIV; OpenPGP** *Native OTP support excludes HMAC-SHA1 Challenge-Response credentials **The YubiKey's OpenPGP feature can be used over USB or NFC with third-party application OpenKeyChain app, which is available on Google Play. Note that this distinction probably doesn't matter that much for a thick-client local app like KeePass, but it definitely matters for anything. Note that 1FA, when using this feature, will weaken security as it no longer prompts for the chalenge password and will decrypt the volume with only the Yubikey being present at boot time. Extended Support via SDK Challenge-Response (HMAC-SHA1) Get the plugin from AUR: keepass-plugin-keechallenge AUR; In KeePass additional option will show up under Key file / provider called Yubikey challenge-response; Plugin assumes slot 2 is used; SSH agent. Its my understanding this is a different protocol " HOTP hardware challenge response Then your Yubikey works, not a hardware problem. Add a Review Downloads: 0 This Week Last Update: 2016-10-30. Additionally, KeeChallenge encrypts the S with the pre-calculated challenge-response pair, and stored the encrypted secret and challenge in an auxiliary XML file. To clarify, the YubiKey's OTP application, which is what the YubiKey Personalization Tool interacts with specifically, works essentially like a USB keyboard, which is why Input Monitoring permission is needed. This is a different approach to. You will be overwriting slot#2 on both keys. Apps supporting it include e. Set "Key Derivation Function" AES-KDF (KDBX 4) after having this set to Argon 2 (KDBX 4) 3. Use the YubiKey Manager to configure FIDO2, OTP and PIV functionality on your YubiKey on Windows, macOS, and. Insert your YubiKey. USB Interface: FIDO. mode=[client|challenge-response] Mode of operation, client for OTP validation and challenge-response for challenge-response validation. The driver module defines the interface for communication with an. :)The slots concept really only applies to the OTP module of the YubiKey. PORTABLE PROTECTION – Extremely durable, waterproof, tamper resistant,A YubiKey have two slots (Short Touch and Long Touch), which may both be configured for different functionality. Open up the Yubikey NEO Manager, insert a YubiKey and hit Change Connection Mode. Two major differences between the Yubico OTP and HMAC-SHA1 challenge-response credentials are: The key size for Yubico OTP is 16 bytes, and the key size for HMAC. 6. so mode=challenge-response. Please add funcionality for KeePassXC databases and Challenge Response. Private key material may not leave the confines of the yubikey. Download and install YubiKey Manager. USB Interface: FIDO. Send a challenge to a YubiKey, and read the response. This tool can configure a Yubico OTP credential, a static password, a challenge-response credential or an OATH HOTP credential in either or both of these slots. If you have a normal YubiKey with OTP functionality on the first slot, you could add Challenge-Response on the second slot. Using. Then in Keepass2: File > Change Master Key. The YubiKey Personalization Tool looks like this when you open it initially. Data: Challenge A string of bytes no greater than 64-bytes in length. The YubiHSM secures the hardware supply chain by ensuring product part integrity. Additionally, KeeChallenge encrypts the S with the pre-calculated challenge-response pair, and stored the encrypted secret and challenge in the XML file. If an attacker gained access to the device storing your key file then they could take a copy and you'd be none the wiser. Perhaps the Yubikey challenge-response (configured on slot 2) cannot be FWD, but reading the drduh guide, it seems possible to access some smartcard functionalities during/on remote. Debug info: KeePassXC - Version 2. The Password Safe software is available for free download at pwsafe. Bitwarden Pricing Chart. A YubiKey have two slots (Short Touch and Long Touch), which may both be configured for different functionality. Expected Behavior. Ensure that the challenge is set to fixed 64 byte (the Yubikey does some odd formatting games when a variable length is used, so that's unsupported at the moment). Weak to phishing like all forms of otp though. “Implementing the challenge-response encryption was surprisingly easy by building on the open source tools from Yubico as well as the existing. Make sure the service has support for security keys. This option is only valid for the 2. Rendez-vous dans l'onglet Challenge-response puis cliquez sur HMAC. Debug info: KeePassXC - Version 2. Note: With YubiKey 5 Series devices, the USB interfaces will automatically be enabled or disabled based on the applications you have enabled. The YubiKey 5 series can hold up to 32 OATH credentials and supports both OATH-TOTP (time based) and OATH-HOTP. Select the configuration slot you want to use (this text assumes slot two, but it should be easy enough to adapt. I have the database secured with a password + yubikey challenge-response (no touch required). According to google, security keys are highly effective at thwarting phishing attacks, including targeted phishing attacks. The main advantage of a YubiKey in challenge-response over a key file is that the secret key cannot be extracted from the YubiKey. The YubiKey Personalization Tool can help you determine whether something is loaded. Plugin for Keepass2 to add Yubikey challenge-response capability Brought to you by: brush701. This just just keepassx/keepassx#52 rebased against keepassxc. Challenge response uses raw USB transactions to work. Yes, it is possible. USING KeeChallenge works using the HMAC-SHA1 challenge response functionality built into the Yubikey. The OS can do things to make an attacker to not manipulate the verification. ykpersonalize -v-2-ochal-resp-ochal-hmac-ohmac-lt64-ochal-btn-trig-oserial-api-visible #add -ochal-btn-trig to require button press. I tried each tutorial for Arch and other distros, nothing worked. A Security Key's real-time challenge-response protocol protects against phishing attacks. auth required pam_yubico. Set up slot 2 in challenge response mode with a generated key: $ ykman otp chalresp --generate 2 You can omit the --generate flag in order to provide a. If a shorter challenge is used, the buffer is zero padded. Strong security frees organizations up to become more innovative. Open it up with KeePass2Android, select master key type (password + challenge-response), type in password, but. Time based OTPs- extremely popular form of 2fa. The YubiHSM secures the hardware supply chain by ensuring product part integrity. Challenge-response. After the OTP is verified, your application uses the public identity to validate that the YubiKey belongs to the user. When unlocking the database ensure you click on the drop down box under "Select master key type" and choose "Password + challenge-response for KeePassXC". The U2F application can hold an unlimited number of U2F credentials and is FIDO certified. If you are on Windows 10 Pro or Enterprise, you can modify the system to allow companion devices for Windows Hello. So configure the 2nd slot for challenge-response: ykman otp chalresp --generate --touch 2. intent. The YubiKey 5C NFC combines both USB-C and NFC connections on a single security key, making it the perfect authentication solution to work across any range of modern devices and leading platforms such as iOS, Android, Windows, macOS, and Linux. I've got a KeePassXC database stored in Dropbox. To do this. If they gained access to your YubiKey then they could use it there and then to decrypt your. Dr_Bel_Arvardan • 22 days ago. AppImage version works fine. Apparently Yubico-OTP mode doesn’t work with yubico-pam at the moment. Hello, I am thinking of getting a yubikey and would like to use it for KeepassXC. KeeChallenge works using the HMAC-SHA1 challenge response functionality built into the Yubikey. Reason: Topic automatically closed 6 months after creation. 8 YubiKey Nano 14 3 Installing the YubiKey 15 3. YubiKey is a hardware authentication device that supports one-time passwords, public-key encryption and authentication, and the Universal 2nd Factor. This key is stored in the YubiKey and is used for generating responses. Active Directory (3) Android (1) Azure (2). Can be used with append mode and the Duo. This library makes it easy to use. When the secret key is implanted, the challenge response is duplicated to each yubikey I implant it onto. I'm hoping someone else has had (and solved) this problem. You now have a pretty secure Keepass.