mastodon.zunda.ninja is one of the many independent Mastodon servers you can use to participate in the fediverse.
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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zunda

libpam-yubicoは古くなってYubico OTPからU2Fに移行したほうが良いのかな?

Archived yubico-pam repository?
https://www.reddit.com/r/yubikey/comments/1jkc0p7/archived_yubicopam_repository/

SSHの第2要素にTOTPかYubico OTPを利用する
https://qiita.com/zunda/items/c61528397ca49ba797c6