宇田川浩行(希哲館)✅ is a user on mn.kitetu.com. You can follow them or interact with them if you have an account anywhere in the fediverse.
宇田川浩行(希哲館)✅ @hiro

SSH の鍵認証を日常的に使っている人ならイメージが掴みやすいと思う。