If you want to encrypt, hide and etc, I would suggest to use TrueCrypt or VeraCrypt software. This wont really help if you want to encrypt and hide it from police and their IT/hacking departments specialists. But in most cases that will do. Just use strong password when you encrypt and it will takes lots of time and resources to bruteforce it.
Thank you for your help, I just want to encrypt some of my personal important files, such as passwords. I want to store them in a folder. Of course, the folder I want to encrypt does not violate the law, and the things I want to encrypt are worthless to hackers.
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Thanks, I will try it later. I have used Kleopatra for asymmetric encryption, but I think it can only encrypt messages.