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AFAIK, with Ghost, you can not password protect specific posts. Though depending on your usecase, there are somethings you can try.
If the Ghost blog is solely for the purpose of sharing private content, you can password protect the entire blog by checking Enable password protection under “Make this blog private” on the settings page:

If the blog is public, you can get unique preview links for unpublished posts in the post’s settings:

You’ll get a sharable link like http://my-ghost-blog.com/p/de1a059d-a0ec-4f13-871c-37161a435db1/ The post will be visable for anyone with the link, but it is not indexed.