It is important not to use any passphrases on such server keys.

在这种服务器密钥上不使用任何密码是很重要的。

youdao

It relies on so-called "passphrases," which are longer but much easier to remember.

它依靠所谓的“口令句”，更长一些，但是记起来要容易得多。

youdao

Best of all, cron tasks are now able to use OpenSSH commands to securely access remote machines without requiring the interactive use of passphrases.

最好的是，cron任务现在可以使用OpenSSH命令来安全地访问远程计算机，而不需要交互地使用密码短语。

youdao

Passphrases are, on average, several orders of magnitude harder to crack than passwords.

ECONOMIST: Online security