![]() ![]() Zsh: command not found: ykman otp delete 1 Do you really want to delete the configuration of slot 1? : yĭeleting the configuration in slot ykman otp info This is how you can use ykman otp static -keyboard-layout de 1 Enter a static password: hello world The only advantage would be that you don’t have to remember the complex password. Even if you enter a password manually and concatenate it with the password of the Yubikey, a keylogger still gets both parts (assumption: You don’t reuse passwords). I don’t see any use case or security benefits by using the static password feature. For the YubiKey 5 NFC, there are two slots you can use (a short touch triggers slot 1, long touch triggers slot 2). You can use the Yubikey to simulate a keyboard (HID - Human Interface Device) to enter a static password. Your public key has been saved in /home/kmille/.ssh/id_ecdsa_sk.pub Your identification has been saved in /home/kmille/.ssh/id_ecdsa_sk Key enrollment failed: requested feature not ssh-keygen -t ecdsa-skĮnter file in which to save the key (/home/kmille/.ssh/id_ecdsa_sk):Įnter passphrase (empty for no passphrase): Generating public/private ecdsa-sk key pair. Key enrollment failed: requested feature not ssh-keygen -t ecdsa-sk -O resident You may need to touch your authenticator to authorize key generation. Generating public/private ed25519-sk key pair. If you are interested, here are good reads: ![]() I can’t use ed25519 (only the NSA curve sk-ecdsa-sha2-nistp256) and the resident feature works only on firmware 5.2.3 or higher. I don’t use this feature, because my Yubikey firmware is too old for my needs. Google deployed U2F to their 50,000 employees. A backup can also be your IT department, if they can give you access again. So you have to add multiple U2F devices to your account or add TOTP as additional 2FA method. During authentication, the possession of the private key must be proven (for example by signing a text with the private key).īackup strategy: You can’t make a backup because you don’t have access to the secret/private key. If you add the Yubikey as a security device, the online service just needs to save the public key. How does it work? For U2F, the Yubikey holds an asymmetric keypair (private and public key). It’s also very nice to use it on Android with NFC. You can test U2F on the Yubico demo website. Watch this demo on Youtube to get a feeling for it. During login, you only have to touch the Yubikey. During setup, you pair an online account with a Yubikey device. If you use Firejail sandbox, you need to set browser-disable-u2f no in /etc/firejail/nfig. On Arch Linux, you have to install the libfido2 package. If you use U2F, the browser speaks directly to the Yubikey device, no special drivers or tools are necessary. U2F solves this problem by using a challenge response mechanism that includes the SSL Channel ID and the browser url of the login page ( docs). The TOTP variant is prone to phishing attacks, as users enter their tokens also on phishing sites. Like TOTP tokens, U2F can be used during web logins for two-factor authentication. Sometimes U2F is also called FIDO2 or WebAuthn. Secure and convient: U2F (Universal 2nd Factor) This prints the 6-digit token every two seconds (needs pip install -user pyotp). There is also the Yubico Authenticator with NFC support for Android. Yubico Authenticator does not store the secret, it asks the Yubikey device for the token. If you prefer a GUI application, you can use Yubico Authenticator (part of the yubioath-desktop package). You can add 32 of these secrets to a Yubikey device (at least for the Yubikey 5 NFC). The secret key is formatted in base32 (e. It gives you a 6 (sometimes 8) digit token you have to enter during login. In general, TOTP (time based one time password) is used for 2FA (two-factor authentication). Time based one time passwords as second factor Serial number: 1312 Firmware version: 5.1.2 YubiKey 5 NFC (5.1.2) Serial: 1312 ykman info
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