[Plugin: User Access Manager] RSS with username and password

Hello everyone,
I do not speak English and use google translator.

I created some groups of people (friends, acquaintances, colleagues, etc..) and each of my articles I have assigned to a group.

By connecting to the portal, everything is ok! Everyone can see only the items of its group.

However, with an RSS reader, everyone can see the titles of all articles, even those of other groups, even if they can then read the article.
But that’s not good.
Can I do so that everyone receives the feed only the articles to which it has access?
Is possible to ask for username and password to your users?

Thanks