🚀 go-pugleaf

RetroBBS NetNews Server

Inspired by RockSolid Light RIP Retro Guy

Article View: sci.crypt
Article #1094

Re: Prime generation, a possible weakness in PGP?

#1094
From: Ari Huttunen
Date: Sun, 11 Oct 1992 19:11
25 lines
1823 bytes
In article <1992Oct9.160150.13377@eoc.com> ahaley@eo17 (Andrew Haley) writes:

! Large pseudoprimes (of any base) are very rare indeed. 

Are pseudoprimes to base X, where X is large more rare than
pseudoprimes to base Y, where Y is small.

! wrong.)  In any case, it is likely that a composite p or q would cause
! messages to not decrypt correctly, a fact that you'd soon notice.

Perhaps, but I wouldn't bet on it, unless I got some proof.

! It might be worth using the Miller-Rabin test, in which no analogues
! of Carmichael numbers exist, as a backup.  This would be easy to add
! to the search procedure, but I don't think that it's really necessary.

I have some code that does exactly that (uses the Miller test). The 
reason I became worried was that Kenneth Rosen incorrectly states
in his book that "If n is composite the probability that n passes
all k tests is less than (1/4)^k." This is incorrect as was pointed out.
--
...............................................................................
Ari Huttunen   			       Any similarity to other alien life forms
				          is purely coincidental.
					      <Alien 3 misquote>
Technical Details
Message-ID: <ARI.HUTTUNEN.92Oct11211134@cardhu.cs.hut.fi>
Path: arc1-ca.pugleaf.net!sparky!uunet!math.fu-berlin.de!unidui!rrz.uni-koeln.de!Germany.EU.net!mcsun!fuug!funic!news.cs.hut.fi!cs.hut.fi!Ari.Huttunen
References: <ARI.HUTTUNEN.92Sep27174550@laphroaig.cs.hut.fi> <1992Oct9.160150.13377@eoc.com>

Show Full Headers
Complete Article Headers
Newsgroups: sci.crypt
Path: arc1-ca.pugleaf.net!sparky!uunet!math.fu-berlin.de!unidui!rrz.uni-koeln.de!Germany.EU.net!mcsun!fuug!funic!news.cs.hut.fi!cs.hut.fi!Ari.Huttunen
From: Ari.Huttunen@hut.fi (Ari Huttunen)
Subject: Re: Prime generation, a possible weakness in PGP?
In-Reply-To: ahaley@eo17's message of Fri, 9 Oct 1992 16:01:50 GMT
Message-ID: <ARI.HUTTUNEN.92Oct11211134@cardhu.cs.hut.fi>
Lines: 25
Sender: usenet@cs.hut.fi (Uutis Ankka)
Organization: Helsinki University of Technology, Finland
References: <ARI.HUTTUNEN.92Sep27174550@laphroaig.cs.hut.fi>
 <1992Oct9.160150.13377@eoc.com>
Distribution: alt
Date: Sun, 11 Oct 1992 19:11:37 GMT