J-Jamet moved this from In progress to To do in 3. HMAC-SHA1 Challenge-Response; Static Password; OATH-HOTP; USB Interface: OTP. Note: This section can be skipped if you already have a challenge-response credential stored in slot 2 on your YubiKey. Use Yubico Authenticator for Android with YubiKey NEO devices and your Android phones that are NFC-enabled. Description Use the Password Manager KeePassXC with Yubikey Challenge-Response mode. For this tutorial, we use the YubiKey Manager 1. HOTP - extremely rare to see this outside of enterprise. The format is username:first_public_id. 4. Yubikey Personalization Tool). Challenge/response questions tend to have logical answers—meaning there is a limited number of expected answers. It should start with "cc" or "vv". Send a challenge to a YubiKey, and read the response. Account Settings. Challenge-response is a fine way for a remote or otherwise secured system to authenticate. Plug in your YubiKey and start the YubiKey Personalization Tool. The problem with Keepass is anyone who can execute Keepass can probably open up the executable with notepad, flip a bit in the code, and have the challenge-response do the. When generating keys from passphrase, generate 160 bit keys for modes that support it (OATH-HOTP and HMAC challenge response). When I tried the dmg it didn't work. U2F. The U2F application can hold an unlimited number of U2F. 4, released in March 2021. Make sure the service has support for security keys. Neither yubico's webauth nor bank of americas webauth is working for me at the moment. In the SmartCard Pairing macOS prompt, click Pair. Steps to ReproduceAuthentication Using Challenge-Response; MacOS X Challenge-Response; Two Factor PAM Configuration; Ubuntu FreeRadius YubiKey; YubiKey and FreeRADIUS 1FA via PAM; YubiKey and FreeRADIUS via PAM; YubiKey and OpenVPN via PAM; YubiKey and Radius via PAM; YubiKey and SELinux; YubiKey and SSH via PAMPay attention to the challenge padding behavior of the Yubikey: It considers the last byte as padding if and only if the challenge size is 64 bytes long (its maximum), but then also all preceding bytes of the same value. :)OTP, OATH-HOTP, Challenge-Response, and Static Password) that is loaded in each slot. so, pam_deny. CHALLENGE_RESPONSE, which accepts an extra byte [] challenge and returns an extra byte [] response. KeeChallenge encrypts the database with the secret HMAC key (S). See examples/nist_challenge_response for an example. So I use my database file, master. YubiKey support in KeePass ecosystem is a wild zoo of formats and methods. HMAC-SHA1 Challenge-Response; Static Password; OATH-HOTP; USB Interface: OTP. If you do not have the Challenge-Response secret: Re-set up your primary YubiKey with the service(s) that use Challenge-Response. Remove the YubiKey challenge-response after clicking the button. Yes you can clone a key, if you are using hmac-sha1, download the yubikey personalisation tool. Setup. Steps to Reproduce (for bugs) 1: Create a database using Yubikey challenge-response (save the secret used the configure the. 2. 4. I used KeePassXC to set-up the challenge response function with my YubiKey along with a strong Master Key. It will allow us to generate a Challenge response code to put in Keepass 2. 3. In addition, you can use the extended settings to specify other features, such as to disable fast triggering, which prevents the accidental triggering of. In this example we’ll use the YubiKey Personalization Tool on Mac, but the steps will be very similar on other platforms. The SetPassword() method allows you to set the static password to anything of your choosing (up to 38 characters in length). The described method also works without a user password, although this is not preferred. You will have done this if you used the Windows Logon Tool or Mac Logon Tool. Login to the service (i. This library. I suspect that the yubico personalization tool always sends a 64 byte buffer to the yubikey. Challenge-Response An off-the-shelf YubiKey comes with OTP slot 1 configured with a Yubico OTP registered for the YubiCloud, and OTP slot 2 empty. GameStop Moderna Pfizer Johnson & Johnson AstraZeneca Walgreens Best Buy Novavax SpaceX Tesla. x firmware line. Plug in your YubiKey and start the YubiKey Personalization Tool. I agree - for redundancy there has to be second option to open vault besides Yubikey (or any other hardware token). Need help: YubiKey 5 NFC + KeePass2Android. Run: ykpersonalize -2 -ochal-resp -ochal-hmac -ohmac-lt64 -oserial-api-visible This key is stored in the YubiKey and is used for generating responses. Please add funcionality for KeePassXC databases and Challenge Response. ykpersonalize -v-2-ochal-resp-ochal-hmac-ohmac-lt64-ochal-btn-trig-oserial-api-visible #add -ochal-btn-trig to require button press. First, configure your Yubikey to use HMAC-SHA1 in slot 2. 7. node file; no. Here is how according to Yubico: Open the Local Group Policy Editor. This is why a yubikey will often type gibberish into text fields with a user accidentally knocks the side of their token. 8 YubiKey Nano 14 3 Installing the YubiKey 15 3. 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. OATH. Encrypting a KeePass Database Enable Challenge/Response on the Yubikey. Using keepassdx 3. So you definitely want have that secret stored somewhere safe if. mode=[client|challenge-response] Mode of operation, client for OTP validation and challenge-response for challenge-response validation. We recently worked with KeePassXC to add OnlyKey support for challenge-response, so now you have two options, YubiKey or OnlyKey for challenge response with KeePassXC. 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. While Advanced unlocking says in its settings menu that it Lets you scan your biometric to open the database or Lets you use your device credential to open the database, it doesn't replace authentication with a hardware token (challenge-response), whereas I expected. Yubico OTP takes a challenge and returns a Yubico OTP code based on it encrypted. Manage certificates and PINs for the PIV application; Swap the credentials between two configured. Hello, I am thinking of getting a yubikey and would like to use it for KeepassXC. The database cannot be saved after "removing" Challenge-Response (it is not marked as changed like before version 2. {"payload":{"allShortcutsEnabled":false,"fileTree":{"examples":{"items":[{"name":"configure_neo_ndef","path":"examples/configure_neo_ndef","contentType":"file. AppImage version works fine. 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. exe "C:My DocumentsMyDatabaseWithTwo. 03 release (and prior) this method will change the LUKS authentication key on each boot that passes. Management - Provides ability to enable or disable available application on YubiKey. First, configure your Yubikey to use HMAC-SHA1 in slot 2. Apps supporting it include e. This should give us support for other tokens, for example, Trezor One, without using their. All three modes need to be checked: And now apps are available. Commands. Perform a challenge-response style operation using either YubicoOTP or HMAC-SHA1 against a configured YubiKey slot. Jestem w posiadaniu Yubikey 5 NFC - wersja 5. ykpersonalize -2 -ochal-resp -ochal-hmac -ohmac-lt64 -oserial-api-visible Mode of operation. An HMAC-SHA1 Challenge-Response credential enables software to send a challenge to the YubiKey and verify that an expected, predetermined response is returned. My Configuration was 3 OTPs with look-ahead count = 0. the Challenge-Response feature turns out to be a totally different feature than what accounts online uses. Any YubiKey that supports OTP can be used. Challenge/Response Secret: This item. In addition to FIDO2, the YubiKey 5 series supports: FIDO U2F, PIV (smart card), OpenPGP, Yubico OTP, OATH-TOTP, OATH-HOTP, and challenge-response. Existing yubikey challenge-response and keyfiles will be untouched. 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. Categories. 1. Initial YubiKey Personalization Tool ScreenNote that triggering slot 2 requires you to hold the YubiKey's touch sensor for 2+ seconds; slot 1 is triggered by touching it for just 1-2 seconds. The HMACSHA1 response is always 20 bytes but the longer challenge may be used by other apps. The YubiKey secures the software supply chain and 3rd party access with phishing-resistant MFA. The U2F application can hold an unlimited number of U2F credentials and is FIDO certified. Context. 5. The best part is, I get issued a secret key to implant onto any yubikey as a spare or just to have. Weak to phishing like all forms of otp though. KeeChallenge works using the HMAC-SHA1 challenge response functionality built into the Yubikey. I've got a KeePassXC database stored in Dropbox. Edit the radiusd configuration file /etc/raddb/radiusd. Build the package (without signing it): make builddeb NO_SIGN=1 Install the package: dpkg -i DEBUILD/yubikey-luks_0. js. As the legitimate server is issuing the challenge, if a rogue site or middle-man manipulates the flow, the server will detect an abnormality in the response and deny the. Keepassium is better then StrongBox because Keepassium works with autofill and yubikey. Possible Solution. See Compatible devices section above for determining which key models can be used. hmac. The YubiKey 5 series can hold up to 32 OATH credentials and supports both OATH-TOTP (time based) and OATH-HOTP (counter based). ”. To enable challenge-response on your Yubikey in slot 2, type the following command: ykman otp chalresp -g 2 This configures slot 2 for challenge-response, and leaves slot 1 alone. YubiKey offers a number of personalization tools. Set a password. Commands. Yubico helps organizations stay secure and efficient across the. 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. 1 Introduction This guide covers how to secure a local Linux login using the HMAC-SHA1 Challenge-Response feature on YubiKeys. Since the YubiKey. 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. This mode is used to store a component of master key on a YubiKey. Its my understanding this is a different protocol " HOTP hardware challenge response Then your Yubikey works, not a hardware problem. so mode=challenge-response Once your YubiKey (or OnlyKey, you got the point…) is set up, open your database in KeePassXC, go to File / Change master key, enable Challenge Response and then save the database. In “authenticate” section uncomment pam to. although Yubikey firmware is closed source computer software for Yubikey is open source. As the legitimate server is issuing the challenge, if a rogue site or middle-man manipulates the flow, the server will detect an abnormality in the response and deny the transaction. 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. For challenge-response, the YubiKey will send the static text or URI with nothing after. In order for KeePassXC to properly detect your Yubikey, you must setup one of your two OTP slots to use a Challenge Response. Yubikey challenge-response already selected as option. The YubiKey 5 series can hold up to 32 OATH credentials and supports both OATH-TOTP (time based) and OATH-HOTP. And unlike passwords, challenge question answers often remain the same over the course of a. Steps to Reproduce (for bugs) 1: Create a database using Yubikey challenge-response (save the secret used the configure the. U2F. kdbx created on the computer to the phone. Viewing Help Topics From Within the YubiKey. Configuration of FreeRADIUS server to support PAM authentication. (For my test, I placed them in a Dropbox folder and opened the . 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. It does not light up when I press the button. Features. KeePassXC and YubiKeys – Setting up the challenge-response mode. The U2F application can hold an unlimited number of U2F credentials and is FIDO certified. YubiKey Personalization Tool shows whether your YubiKey supports challenge-response in the lower right. When an OTP application slot on a YubiKey is configured for OATH HOTP, activating the slot (by touching the YubiKey while plugged into a host device over. Note. How do I use the. Only the response leaves the yubikey; it acts as both an additional hard to guess password, but also key loggers would only be able to use the response to unlock a specific save file. 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. USB and NFC (YubiKey NEO required for NFC) are supported on compatible. Yubikey to secure your accounts. Additionally, KeeChallenge encrypts the S with the pre-calculated challenge-response pair, and stored the encrypted secret and challenge in the XML file. From KeePass’ point of view, KeeChallenge is no different. 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. 2. Posts: 9. Remove YubiKey Challenge-Response; Expected Behavior. In Enter. Among the top highlights of this release are. If the correct YubiKey is inserted, the response must match with the expected response based on the presented challenge. Configure a slot to be used over NDEF (NFC). Display general status of the YubiKey OTP slots. The challenge is stored to be issued on the next login and the response is used as an AES256 key to encrypt the secret. The YubiKey 4 series can hold up to 32 OATH credentials and supports both OATH-TOTP (time based) and OATH-HOTP. C'est l'application YubiKey Personalization Tool qui permet de l'obtenir. Actual BehaviorNo option to input challenge-response secret. In addition, you can use the extended settings to specify other features, such as to disable fast triggering, which prevents the accidental triggering of. Specifically, the module meets the following security levels for individual. Currently I am using KeypassXC with yubikey challenge-response in a ten user environment. Get popup about entering challenge-response, not the key driver app. Click Save. Hey guys, Was hoping to get peoples opinion on the best way to do this, and to see if i have set this up correctly: I have a Yubikey 5 NFC that I have recently configured with KeePass on Windows 10, using the KeeChallenge plugin, in HMAC-SHA1 Challenge-Response mode - (Using this Yubikey Guide and all works great). OnlyKey supports multiple methods of two-factor authentication including FIDO2 / U2F, Yubikey OTP, TOTP, Challenge-response. org. 3: Install ykman (part of yubikey-manager) $ sudo apt-get install yubikey-manager. The Response from the YubiKey is the ultimate password that protects the encryption key. YubiKey FIPS (4 Series) CMVP historical validation list; Infineon RSA Key Generation Issue - Customer Portal; Using YubiKey PIV with Windows' native SSH client; Ubuntu Linux 20+ Login Guide - Challenge Response; YubiKey 5 Series Technical Manual; YubiKey FIPS (4 Series) Deployment Considerations; YubiKey 5 Series Quick Start GuideOATH-HOTP. Actual Behavior. a generator for time-based one-time. If button press is configured, please note you will have to press the YubiKey twice when logging in. 2 and later. Used KeePassXC to Change Master Key and configure YubiKey Challenge-Response. If I did the same with KeePass 2. When I changed the Database Format to KDBX 4. action. Yubikey is working well in offline environment. Private key material may not leave the confines of the yubikey. KeePassXC offers SSH agent support, a similar feature is also available for KeePass. The YubiKey then enters the password into the text editor. ykDroid provides an Intent called net. 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. Posted: Fri Sep 08, 2017 8:45 pm. Add a Review Downloads: 0 This Week Last Update: 2016-10-30. YubiKey modes. 6. In addition, particular users have both Touch ID and Yubikey registered with the same authenticator ID, and both devices share the same verify button. 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. Strong security frees organizations up to become more innovative. /klas. I have the database secured with a password + yubikey challenge-response (no touch required). Select the password and copy it to the clipboard. All of these YubiKey options rely on an shared secret key, or in static password mode, a shared static password. This credential can also be set to require a touch on the metal contact before the response is sent to the requesting software. So yes, the verifier needs to know the. 0 ! We have worked long and hard to bring you lots of new features and bug fixes in a well-rounded release. 2. Open it up with KeePass2Android, select master key type (password + challenge-response), type in password, but. You could have CR on the first slot, if you want. Of course an attacker would still need the YubiKey database along with whatever other key material you've set up (master password, key file, etc. Apps supporting it include e. Post navigation. Expected Behavior. USING KeeChallenge works using the HMAC-SHA1 challenge response functionality built into the Yubikey. How do I use the Touch-Triggered OTPs on a Mobile Device? When using the YubiKey as a Touch-Triggered One-Time Password (OTP) device on a mobile platform, the user experience is slightly different. Be able to unlock the database with mobile application. One spare and one other. When you unlock the database: KeeChallenge loads the challenge C from the XML file and sends it to the YubiKey. Check that slot#2 is empty in both key#1 and key#2. I don't see any technical reason why U2F or challenge-response mode would not be suitable for the Enpass. Configures the challenge-response to use the HMAC-SHA1 algorithm. Requirements. USB Interface: FIDO. 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. OATH-HOTP usability improvements. The OTP module has a "touch" slot and a "touch and hold" slot and it can do any two of the following: - YubiOTP - Challenge-Response - HOTP - Static Password In other words, you can have Challenge Response in slot 2 and YubiOTP in slot 1, etc. We start out with a simple challenge-response authentication flow, based on public-key cryptography. To grant the YubiKey Personalization Tool this permission:Type password. I followed a well-written post: Securing Keepass with a Second Factor – Kahu Security but made a. 6. 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. Use Small Challenge (Boolean) Set when the HMAC challenge will be less than 64-bytes. Misc. The YubiKey is a hardware token for authentication. Maybe some missing packages or a running service. " -> click "system file picker" select xml file, then type password and open database. Same problem here with a macbook pro (core i7) and yubikey nano used in challenge response mode both for login and screen unlock. To further simplify for Password Safe users, Yubico offers a pre. This all works fine and even returns status=OK as part of the response when i use a valid OTP generated by the yubikey. Program a challenge-response credential. The size of the the response buffer is 20 bytes, this is inherent to SHA1 but can by changed by defining RESP_BUF_SIZE. An HMAC-SHA1 Challenge-Response credential enables software to send a challenge to the YubiKey and verify that an expected, predetermined response is returned. An example of CR is KeeChallenge for KeePass where the Yubikey secret is used as part of the key derivation function. Note. This library makes it easy to use. Challenge-response - Provides a method to use HMAC-SHA1 challenge-response. Then indeed I see I get the right challenge response when I press the button. Mind that the Database Format is important if you want to use Yubikey over NFC to unlock database on Android devices. Perform a challenge-response operation. The database uses a Yubikey…I then tested the standard functions to make sure it was working, which it was. Select the configuration slot you want to use (this text assumes slot two, but it should be easy enough to adapt. Credential IDs are linked with another attribute within the response. Also, as another reviewer mentioned, make sure the Encryption Algorithm is set to AES-256 and the Key Derivation Function is set to AES. Note that this distinction probably doesn't matter that much for a thick-client local app like KeePass, but it definitely matters for anything. md","path. jmr October 6, 2023,. Time based OTPs- extremely popular form of 2fa. Mobile SDKs Desktop SDK. USING KeeChallenge works using the HMAC-SHA1 challenge response functionality built into the Yubikey. KeePass is a light-weight and easy-to-use open source password manager compatible with Windows, Linux, Mac OS X, and mobile devices with USB ports. KeeChallenge sends the stored challenge to the YubiKey The response is used for decrypting the secret stored in the XML file The decrypted secret is used for decrypting the database There are several issues with this approach: The secret key never changes, it only gets reencrypted. The following method (Challenge-response with HMAC-SHA1) works on Ubuntu with KeePassXC v2. so, pam_deny. Debug info: KeePassXC - Version 2. Add a "Recovery" box to the challenge-response area that allows a hex string to be entered and used for the challenge response computation. In “authenticate” section uncomment pam to. The default is 15 seconds. The YubiKey 5 FIPS Series can hold up to 32 OATH credentials and supports both OATH-TOTP (time based) and OATH-HOTP (counter based). To use the YubiKey for multi-factor authentication you need to. Which is probably the biggest danger, really. KeeChallenge has not been updated since 2016 and we are not sure about what kind of support is offered. 2 and later. 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. I suspect that the yubico personalization tool always sends a 64 byte buffer to the yubikey. auth required pam_yubico. KeePassXC, in turn, also supports YubiKey in. Challenge response uses raw USB transactions to work. 4. YubiKey Personalization Tool shows whether your YubiKey supports challenge-response in the. Authenticator App. Challenge response uses raw USB transactions to work. I have a Yubikey 5 NFC that I have recently configured with KeePass on Windows 10, using the KeeChallenge plugin, in HMAC-SHA1 Challenge-Response mode - (Using this Yubikey Guide and all works great). To do this. 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. 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. (Verify with 'ykman otp info') Repeat both or only the last step if you have a backup key (strongly recommended). The "challenge-response" function of the OTP applet ("YubiKey slots") uses HMAC to compute the response from the challenge. 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. Introducing the YubiKey 5C NFC - the new key to defend against hackers in the age of. Program an HMAC-SHA1 OATH-HOTP credential. If you're using the yubikey with NFC you will also need to download an app called "ykDroid" from the playstore- this is a passive application that acts as a driver. Generate One-time passwords (OTP) - Yubico's AES based standard. The recovery mode from the user's perspective could stay the. Configuration of FreeRADIUS server to support PAM authentication. xml file are accessible on the Android device. Posted. I am still using similar setup on my older laptop, but for the new one, I am going to stop using YubiKey HMAC-SHA1. the Challenge-Response feature turns out to be a totally different feature than what accounts online uses. The . (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. It is better designed security-wise, does not need any additional files, and is supported by all the apps that support YubiKey challenge-response: KeePassXC, KeeWeb, KeePassium, Strongbox, Keepass2Android, KeePassDX, and probably more. What I do personally is use Yubikey alongside KeepassXC. ), and via NFC for NFC-enabled YubiKeys. Happy to see YubiKey support! I bought the Pro version as a thank you ️🙏🏻. In the 19. There are a number of YubiKey functions. Then “HMAC-SHA1”. Which I think is the theory with the passwordless thing google etc are going to come out with. The last 32 characters of the string is the unique passcode, which is generated and encrypted by the YubiKey. Send a challenge to a YubiKey, and read the response. Depending on the method you use (There are at least 2, KeepassXC style and KeeChallenge style) it is possible to unlock your database without your Yubikey, but you will need your Secret. 5 Challenge-response mode 11 2. Note: With YubiKey 5 Series devices, the USB interfaces will automatically be enabled or disabled based on the applications you have enabled. Configure a slot to be used over NDEF (NFC). I searched the whole Internet, but there is nothing at all for Manjaro. /klas. YubiKey can be used in several modes with KeeWeb: Challenge-response: to provide a hardware-backed component of master key; OATH: for generating one-time codes; Challenge-response. HMAC-SHA1 Challenge-Response; Static Password; OATH-HOTP; USB Interface: OTP. So configure the 2nd slot for challenge-response: ykman otp chalresp --generate --touch 2. Choose “Challenge Response”. Yubico Login for Windows is a full implementation of a Windows Authentication Package and a Credential Provider. On the note of the nitrokey, as far as I am aware it does not support the HMAC-SHA1 protocol - the challenge-response algorithm that the YubiKey uses. 1. Check Key file / provider: and select Yubikey challenge-response from drop-down. Using keepassdx 3. 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. 5 beta 01 and key driver 0. This does not work with remote logins via. YubiKey is a hardware authentication device that supports one-time passwords, public-key encryption and authentication, and the Universal 2nd Factor. kdbx file using the built-in Dropbox support)Business, Economics, and Finance. All four devices support three cryptographic algorithms: RSA 4096, ECC p256, and ECC p384. Agreed you can use yubikey challenge response passively to unlock database with or without a password. 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. KeePassXC offers SSH agent support, a similar feature is also available for KeePass using the KeeAgent plugin. Configure yubikey for challenge-response mode in slot 2 (leave yubico OTP default in slot 1). Use the KeeChallenge plugin with Keepass2 on the Desktop, and the internal Challenge. Note that Yubikey sells both TOTP and U2F devices. If you. *-1_all. Scan yubikey but fails. To use a YubiKey or OnlyKey for securing your KeePassXC database, you have to configure one of your YubiKey / OnlyKey slots for HMAC-SHA1 Challenge Response mode (see. This tool can configure a Yubico OTP credential, a static password, a challenge-response credential or an OATH HOTP credential in both of these slots. If valid, the Yubico PAM module extracts the OTP string and sends it to the Yubico authentication server or else it.