Password condition setting of health management system for food employees in Taiyuan city

The password conditions of health management system for food employees in Taiyuan City are as follows.

There must be uppercase and lowercase letters and numbers, not less than eight and not more than twenty.

Password is a confusing technology, and users want to turn normal (identifiable) information into unrecognizable information. But this unrecognizable information part can be reprocessed, recovered and cracked. Password is a general term for "password" in Chinese. In fact, the "password" entered when logging in to websites, e-mails and withdrawing money from banks should be strictly called "password" because it is not the original "encryption code", but it can also be called a secret number. A symbolic system (such as a message) that is mainly limited to personal understanding. Such as cipher telegrams and cipher typewriters.