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Date:      Tue, 7 Sep 1999 20:25:30 -0700 (PDT)
From:      Kris Kennaway <kris@hub.freebsd.org>
To:        Geoff Rehmet <geoffr@is.co.za>
Cc:        hackers@freebsd.org, markm@iafrica.com, jlemon@freebsd.org
Subject:   RE: TCP sequence numbers
Message-ID:  <Pine.BSF.4.10.9909072024070.68426-100000@hub.freebsd.org>
In-Reply-To: <E3453EC6C52ED3118E7E0090275CD47CFFB0F3@isjhbex.is.co.za>

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On Thu, 2 Sep 1999, Geoff Rehmet wrote:

> > I'd expect Yarrow to be (perhaps quite a bit) slower than our existing
> > PRNG - it's a more conservative design and uses primitives 
> > like SHA-1 (for
> > yarrow-160). I don't know how much of an impact this would be for
> > network performance.
> 
> If it is only used to generate a secret every 5 minutes, that should not
> be a problem.

Hrm. RFC 1948 seems to warn against changing the secret while "live". It's
not immediately obvious to me why this is so.

Kris



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