2段階認証(2 factor authentication) 2段階認証(2 factor authentication)について https://gist.github.com/asufana/daaa0477df93a5a2870c https://gist.github.com/asufana/daaa0477df93a5a2870c 二段階認証(TOTP)メモ http://qiita.com/xylitol45@github/…