Date: Fri, 9 Jun 2000 15:53:42 -0700 From: "Andrey A. Chernov" <ache@freebsd.org> To: Mark Murray <mark@grondar.za> Cc: "Jeroen C. van Gelderen" <jeroen@vangelderen.org>, Kris Kennaway <kris@FreeBSD.ORG>, current@FreeBSD.ORG Subject: Re: mktemp() patch Message-ID: <20000609155342.B33329@freebsd.org> In-Reply-To: <200006092002.WAA00773@grimreaper.grondar.za>; from mark@grondar.za on Fri, Jun 09, 2000 at 10:02:44PM %2B0200 References: <394124C3.221E61BC@vangelderen.org> <200006092002.WAA00773@grimreaper.grondar.za>
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On Fri, Jun 09, 2000 at 10:02:44PM +0200, Mark Murray wrote:
> > > But I repeat myself; are you still intending to use cryptographic security
> > > for one bit? What does that buy you? An attacker will laugh at the waste
> > > of resources that went into a coin-flip :-). Much better is to use something
> > > cheaper like time-of-day XOR 1 << whatever.
> >
> > Pseudo random numbers are so cheap (or they should be) that you
> > just don't want to try and 'optimize' here. It is much better to
> > be conservative and use a good PRNG until it *proves* to be very
> > problematic.
>
> Why not just XOR the whole lot into the current ${randomnumber}?
> That way, at least the effort of the whole calculation is not wasted
> as much.
Why to XOR true random bits from arc4random() with non-random bits from
getpid()? It only weakens. Better way is just remove any getpid() code and
left arc4random() only.
--
Andrey A. Chernov
<ache@nagual.pp.ru>
http://ache.pp.ru/
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