YubiKey-Guide VS yubikey-manager

Instead, most people generate keypair(s) on an airgapped machine and write them to two Yubikeys. Or write subkeys to a single Yubikey and keep a backup in encrypted form. See https://github.com/drduh/YubiKey-Guide

I'd recommend using the Yubikey as a GPG smartcard[1]. The private key stays on the Yubikey. I also use it for ssh. But make sure you have a backup key or two, just in case the primary Yubikey gives out. FIDO2 and all other regular Yubikey functionality still works with it.

[1]: https://github.com/drduh/YubiKey-Guide

The excellent guide by drduh should be mentioned here: https://github.com/drduh/YubiKey-Guide — I've been using this approach for years to store my OpenPGP keys on Yubikeys and use them for SSH.

I don't generate my keys on devices. That lets me be flexible and keep backups, as well as use the same keys on multiple physical devices. Using a single yubikey is a bad idea, as you're bound to eventually lose it or break it. Hasn't happened to me yet in 5 years, but I expect it to happen.

I followed this guide to generate a master key and three subkey.

See https://github.com/drduh/YubiKey-Guide . Also google for OpenPGP card specifications, they will answer your question

Regarding GPG/SSH keys, there is a great howto: https://github.com/drduh/YubiKey-Guide

I'd be lying if I said I understood all of that. I'm definitely going to do some research ahaha. Someone else on this post sentence this like which they said was very good guide. https://github.com/drduh/YubiKey-Guide

When storing the key on a Yubikey, however, all you need is just the PIN in order to use the key. It can contain numbers, letters, symbols, etc. and can be quite long, so you can treat it as a passphrase for all intents and purposes. There are actually two PIN codes: one regular one, for a read access, and another administrative one, for write access for when you want to modify the gpg applet settings or the key on the Yubikey. There is also a limit to how many times in a row you can enter pins incorrectly, after which the gpg applet gets locked and the only thing you can do is reset it, erasing the PGP keys. See https://github.com/drduh/YubiKey-Guide for more information.

Try follow this guide from DrDuh https://github.com/drduh/YubiKey-Guide/blob/master/README.md

You'll probably want at least the yubico authenticator and manager apps / tools e.g. https://www.yubico.com/products/yubico-authenticator/ https://github.com/Yubico/yubioath-flutter/releases/tag/6.1.0 https://github.com/Yubico/yubikey-manager

There is an alwaysUV option that was added to CTAP2 recently, but I think it's only the YubiKey BIO that implements it at the moment. There is an open issue to make the setting configurable in YubiKey Manager (which would presumably also tell you whether your YubiKey model supports it), but as of right now you would need the lower-level python-fido2 library to do it.

This any help? https://github.com/Yubico/yubikey-manager/issues/464

you can search for programs using whereis before running them. also it might be called something different that is why I said try the TAB autocompletion. according to their github the command is called ykman. it's a command line utility only, meaning, don't expect to see a graphical window unfortunately. there is a documentation on their site but I suggest to NOT follow it for installing as it is quite outdated (ubuntu 10.04). go to their github page I linked and follow the instructions there. can't help more as I don't use it.