How to access a file that is hosted on the C++ internet?

Question

Programming

Good day. The essence of the question is this: I need to upload to the network (preferably in private access) a file that will contain a set of users of my program. When the program is launched on a PC, this file will be accessed for authorization, after which personal information about the user will be obtained from this file. Tell me, please, what storage can be suitable for this purpose and at least the direction in which it is worth looking for means of implementation (on what topic to wool the Internet).
Thanks in advance

Answer 1

Why in a file? It would be better in a base, a regular relational one, and it would be better to wrap it in some kind of service for authorization, which will issue keys / tokens that allow you to perform certain actions in the program. For what exactly? Limit access to paid functionality?

Answer 2

And if the user's Internet is turned off? :)))
Why reinvent the wheel if there are already secure software development kits? :) And there are keys with timers, and encryption, and other soft stuff - if you want, write at least a piece of code into the encrypted space so that it works like a black box - you don’t copy anything into memory, it executes inside the key and gives out the results :)