carrick, Blowfish & the NSA

[K00l Secrets]

In article <Pine.LNX.3.92.960414121820.358A-100000 at gak> "Mark M." <markm at voicenet.com> writes:

> I haven't heard of any efficient cryptanalysis against Blowfish.  I
> know there are weak keys, but they are difficult to exploit.  16
> round Blowfish can be broken using differential cryptanalysis with
> 2^128+1 chosen plaintexts.

Doesn't this assume known S-boxes, though?  If so, since the S-boxes
are key dependent, is this anything to worry about?