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Date:      Thu, 12 Jan 95 21:52:49 MET
From:      wietse@wzv.win.tue.nl (Wietse Venema)
To:        guido@gvr.win.tue.nl (Guido van Rooij)
Cc:        mark@grondar.za, hackers@FreeBSD.org, wietse@gvr.win.tue.nl
Subject:   Re: S/Key - What gives?
Message-ID:  <199501122052.VAA20779@wzv.win.tue.nl>
In-Reply-To: <199501121925.UAA07509@gvr.win.tue.nl>; from "Guido van Rooij" at Jan 12, 95 8:25 pm

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> >    b) Joe Cracker comes along and wants to see if account "bloggs" exists:
> >    But the absence of the s/key bit already told him he's barking up the
> >    wrong tree. Maybe a random number should be thrown in as a confuser?

Well, the bogus challenge should be constant for at least an hour or
so.  I the s/key mailing list I proposed to seed the algorithm with the
inode ctime of '/'. That information is stable enough, and should not
be accessible to Joe Cracker.

	Wietse



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