ワンタイムパスワード（OTP）による二要素認証

Nitrokey 3

Nitrokey Passkey

Nitrokey FIDO2

`ニトロキーU2F<https://docs.nitrokey.com/nitrokeys/u2f/index.html>`_

`Nitrokey HSM 2<https://docs.nitrokey.com/nitrokeys/hsm/index.html>`_

Nitrokey Pro 2

`Nitrokey Start<https://docs.nitrokey.com/nitrokeys/start/index.html>`_

`ニトロキー・ストレージ2<https://docs.nitrokey.com/nitrokeys/storage/index.html>`_

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