The login requirement is what has us stumped a bit... Is the login protection a permission that you set yourselves via the administrative module permissions for the RSS feed? There are a bunch of options, but it's kind of hard to say exactly what you should do without seeing how you have it setup now. Need to know things like is this a widget, or a service? How is it getting run, manually or via a scheduled sync? Is it integrated into Sitefinity or is it an external tool that is publishing into Sitefinity?
Having said that... You have a number of options you can use, but some will depend on your preferred security reqs.
Is this a custom widget you have built within Sitefinity? If so, then the easiest thing to do might be to set these keys in a designer using Thunder. Basically you can add custom fields that set properties in your widgets and these fields will have their data stored and accessible in your code at run time. If that's not secure enough for you, then you could also do something along the lines of setting the username only in the designer and then querying the user based on the UN
to get the password . If this sounds like an option, but you are not familiar with this approach, let me know and I can guide you through the process.
Let me know about the above. I think we're close, but I need to clear up a few of the items I have listed.
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