Surely lack of salting is a really basic issue? I'm surprised it took so long for someone to notice this, to be honest.
A good implementation, actually, would be to reserve a few bytes at the start of every block for a per-block salt value; along with a per-volume salt, that should cause quite a bit of difficulty for prospective attackers. ;)
But I definitely would agree with other posters, and not call this issue a "back door".
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