[ECOS] Re: Entropy gathering?
Fri Apr 4 14:15:00 GMT 2008
On 2008-04-04, Markus Schaber <firstname.lastname@example.org> wrote:
>> I've been googling to find some source material on practical
>> aspects of maintaining an entropy pool, but so far haven't
>> found much of anything.
> Maybe you can ask in the UseNet Newsgroup sci.crypt (after
> assuring that their FAQ doesn't contain some useful pointers).
Thanks, I'll check the sci.crypt FAQ. I should have thought of
that. I also found that googling for "entropy pool" found some
useful stuff. I had been googling for entropy gathering and
entropy extraction without much luck.
> Also, libtomcrypt or the CryptoPP lib may contain entropy
> code. OpenSSL / GnuTLS definitely have, but they both are
> rather heavyweight.
Yup. We porting OpenSSL (and looked at some of the other
ports) before deciding on a different SSL library (which
requires an external entropy source).
> And "Applied Cryptography" by Bruce Schneier, and
> "Cryptograpyh for developers" by Tom St. Denis may be worth a
I've got Schneier, Kelsy, and Ferguson's Yarrow paper, and that
looks like a good starting point. I really ought to buy
Schneier's book. [Funny thing: it turns out that Bruce Schneier
lives about six blocks from me (and I drive past his house
regularly). And he used to live about 2 miles from my sister's
house which is 400+ miles away from here.]
> There are also some recent articles analyzing the entropy
> pools from Linux, BSDish Systems and Windows, where some
> weaknesses showed up.
> Cryptography is a field of mines, and most ad-hoc
> implementations by non-experts turn out to be severely broken
> some time after deployment.
I know. That's why I'm a bit worried about using eCos's
arc4_random() as an entropy source for crypto purposes.
Grant Edwards grante Yow! Thousands of days of
at civilians ... have produced
visi.com a ... feeling for the
aesthetic modules --
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