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- Newsgroups: sci.crypt
- Path: sparky!uunet!sun-barr!cs.utexas.edu!torn!watserv2.uwaterloo.ca!watserv1!graceland.uwaterloo.ca!shallit
- From: shallit@graceland.uwaterloo.ca (Jeffrey Shallit)
- Subject: Re: RSA keys
- Message-ID: <Bs8xDs.Ctp@watserv1.uwaterloo.ca>
- Sender: news@watserv1.uwaterloo.ca
- Organization: University of Waterloo
- References: <1992Jul30.213709.26515@sfc.sony.com>
- Date: Fri, 31 Jul 1992 09:08:14 GMT
- Lines: 20
-
- In article <1992Jul30.213709.26515@sfc.sony.com> weaver@sfc.sony.com (Eric Weaver) writes:
-
- [In RSA scheme, with N = PQ, and DE = 1 (mod (P-1)(Q-1))]
-
- >
- >Question for cognoscenti: How hard is it REALLY to guess or search D
- >from PQ?
- >--
- >Eric Weaver Sony AVTC 677 River Oaks Pkwy, MS 35 SJ CA 95134 408 944-4904
- >& Eng. Asst., KFJC 89.7 - Foothill College, Los Altos Hills, CA 94022
-
- DE-1 is a multiple of (P-1)(Q-1) = phi(N). Gary Miller showed
- in his thesis how to factor general N in random polynomial time,
- given an oracle that returns an arbitrary small multiple of
- phi(N). The reduction is quite efficient. Therefore, any general
- method for finding D (given E and N) would give a fast integer
- factoring algorithm, which some would say is unlikely.
-
- Jeff Shallit
-
-