Duo Security 为 Unix 系统提供双因素身份验证：duo_unix。对于少于 10 个用户的开源项目和安装来说，它是免费的。
免责声明，我是 Duo 开发人员。
Duo Security provides two-factor authentication for Unix systems: duo_unix. It is free for open source projects and installations with less than ten users.
Would you consider something like OPIE? (an S/KEY based OTP system). You should be able to set PAM up to require both a password and the OTP value, and most smartphones can run a generator.
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Duo Security 为 Unix 系统提供双因素身份验证：duo_unix。对于少于 10 个用户的开源项目和安装来说，它是免费的。
免责声明，我是 Duo 开发人员。
Duo Security provides two-factor authentication for Unix systems: duo_unix. It is free for open source projects and installations with less than ten users.
Disclaimer, I am a Duo developer.
您会考虑类似 OPIE 的东西吗？ （基于 S/KEY 的 OTP 系统）。
您应该能够将 PAM 设置为需要密码和 OTP 值，并且大多数智能手机都可以运行生成器。
Would you consider something like OPIE? (an S/KEY based OTP system).
You should be able to set PAM up to require both a password and the OTP value, and most smartphones can run a generator.