Re: /dev/random: really secure?

From: Pavel Machek (
Date: Tue Dec 19 2000 - 12:39:31 EST


> On Mon, Dec 18, 2000 at 04:33:13PM -0500, Theodore Y. Ts'o wrote:
> > Note that writing to /dev/random does *not* update the entropy estimate,
> > for this very reason. The assumption is that inputs to the entropy
> > estimator have to be trusted, and since /dev/random is typically
> > world-writeable, it is not so trusted.
> It should not be world-writeable, IMHO. So the only one who can feed entropy
> there is root, who should know aht (s)he's doing ...
> Here (SuSE Linux 7.x), it is 644:

You actually *want* random people to send entropy into your pool. Just
do not increase counters. That way, entropy can only get better :-).

The best software in life is free (not shareware)!		Pavel
GCM d? s-: !g p?:+ au- a--@ w+ v- C++@ UL+++ L++ N++ E++ W--- M- Y- R+
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