Hello, dear, I'm glad to answer your question. As long as it does not belong to the classification of cryptography, you can choose. The topic is to choose something that does not belong to the password category. According to the code law, the classification of passwords

The state implements classified management of passwords, which are divided into core passwords, common passwords and commercial passwords, which are used to protect different types and grades of passwords respectively:

Core password, protecting state secrets, and protecting top secret, confidential and secret state secrets;

Ordinary passwords protect state secrets, and confidential and secret levels protect state secrets;

Business passwords protect information that is not a state secret.

Legal basis:

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Article 6 The State implements classified management of passwords.

Passwords are divided into core passwords, common passwords and commercial passwords.

Article 7 Core passwords and common passwords are used to protect state secret information. The highest confidential level of information protected by core password is top secret, and the highest confidential level of information protected by ordinary password is confidential.

Core passwords and commonly used passwords are state secrets. The password management department shall, in accordance with this law, relevant laws, administrative regulations and relevant provisions of the state, implement strict and unified management of core passwords and general passwords.

Article 8 Commercial passwords are used to protect non-state secret information.