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Zundon is a single user instance as home of @zundan as well as a test bed for changes of the code.

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左の子は最初の版のたこねこYubiKeyちゃん。FIDO U2Fしかお話できないのがちょっと残念
https://github.blog/2015-10-01-github-supports-universal-2nd-factor-authentication/

右の子はたこねこじゃないけどGPGからスマートカードとして使ってOpenPGP私有鍵を取り出さずに暗号化とか署名とかできたり、Yubico OTPで家サーバへのログインの時に第二要素になれたり、NFCでFIDO U2Fできる優れもの
https://www.yubico.com/jp/product/yubikey-5-nfc/
https://mitome.in/device/yubikey.html
https://qiita.com/zunda/items/c61528397ca49ba797c6

www.yubico.comUSB-A YubiKey 5 NFC Two Factor Security Key | YubicoProtect yourself from account takeovers with the efficient, multi-protocol YubiKey 5 NFC. Go passwordless with our NFC capable security key.