Subject: Re: "LEXR" USB storage device
To: None <firstname.lastname@example.org>
From: Alan Barrett <email@example.com>
Date: 05/17/2003 22:24:31
On Sat, 17 May 2003, Wolfgang S. Rupprecht wrote:
> > umass0: LEXR PLUG DRIVE LEXR PLUG DRIVE, rev 1.10/0.01, addr 2
> > rnd: sd1 attached as an entropy source (collecting)
> What is being used as the entropy source? The data read or the
> rotational/seek delays?
Timing, and the block addresses used. See the call to rnd_add_uint32 in
The "rnd: ... attached ... (collecting)" message is printed only
with options RND_VERBOSE, and indicates that it's both "collecting"
and "estimating" entropy. I'd prefer it to say "(collecting without
estimation)", because I don't have enough trust in the randomness of
timing variations in solid state storage devices.
--apb (Alan Barrett)