I had posted something close to this a couple months ago, but of course it's now gone to the bitbucket. I'll try and redo what I had originally commented on.
1. Whatever scheme you come up with, don't 'tie' it into private, for-pay, or similar ways to de-crypt or show the actual files. The best way I've come up with is to let google do the work, put the scrambled filename into mr. google and have it come up with the plain-text name. There are several ways to do this, figure it out.
1b. Oh, and for those who think that using an 'auto-downloader' scheme to quickly figure out the postings and grab them before they get nailed.... is doomed to eventual failure. Those doing the nailing will simply get better and faster, and will (again, eventually), if they think for a minute that they are loosing, will simply find a judge somewhere who will rule that ALL usenet providers have to provide auto-takedown mechanisms. Then things will get really messy.
2. If you encrypt the upload (winrar encryption), then once again, avoid using private, for-pay, sites. Once again, there are various methods, just like the filename, that can be used.
3. Always re-post the nfo in plain-text, so that the major indexers can 'find' it and 'lead' folks to it's existence, without requiring folks to 'de-crypt' all the encrypted filenames out there.
There are more, but that's about where I started last time. Again, ZERO takedowns over the past 13 years, ZERO back to 'zero day' of usenet, Aug08.
What does this mean? Maybe nothing if you live for PPV pro-wrestling, certain (brain-dead to me) tv shows (that are all available through Netflix!) or p0rn. Folks that do need to put pressure (it's called BITCHING) to those posting things in ways that they get pulled down within seconds, to start following some basic rules.