How to securely store passwords in Linux config files?

Question

linux

Actually an example:
In order for yum to knock through a proxy, you need to register a login / password for the proxy in its config. Is it possible to somehow prescribe it not in open form? What are the alternatives to storing the password in the config?

Answer 1

stackoverflow.com/questions/18943/obscuring-networ...
The last answer suggests storing the password in AES256

Answer 2

Set up IP authorization in the proxy, and no one will be able to go through it from another server.