INN2 set up user authentication via ckpasswd

For latest version of INN2 in Debian stable.

I think using ckpasswd is the most viable option for authentication since it is simple to add and remove users and it is a flat text file without database bugs and vulnerabilities.

I need to prevent all non-authenticated users from posting to newsgroups and authenticate via ckpasswd.

How do I configure INN2 so that I can add users with ckpasswd and force INN2 to authenticate via ckpasswd?

If there is a better method I am all ears. Please don't suggest some 3rd party program that is not included in the Debian stable repos. Please don't suggest something that uses a database or some other attack surface generator. I'm not interested in complicated stuff like that.