Yes, I didn't explain in detail yet, how it works with the current logic. The site puts entered memo and posting keys inside the DOM (HTML Document), so that we don't need to re-enter them again, while we are on the page, but they are not being stored permanently. After closing the page or switching to a different account, they are gone.

I need to store them in cache (encrypted) for the Post Editor and the coming Feed Views, because otherwise people would need to enter their key for each vote/post/comment, which they want to broadcast via SteemWorld.