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- Path: sparky!uunet!cis.ohio-state.edu!ucbvax!virtualnews.nyu.edu!brnstnd
- From: brnstnd@nyu.edu (D. J. Bernstein)
- Newsgroups: sci.crypt
- Subject: Re: RSA-129 contest
- Message-ID: <21385.Aug2322.57.0292@virtualnews.nyu.edu>
- Date: 23 Aug 92 22:57:02 GMT
- References: <9208220157.AA02629@ucbvax.Berkeley.EDU> <8146.Aug2205.17.2492@virtualnews.nyu.edu> <1992Aug22.113206.4385@linus.mitre.org>
- Organization: IR
- Lines: 41
-
- In article <1992Aug22.113206.4385@linus.mitre.org> bs@gauss.mitre.org (Robert D. Silverman) writes:
- > I presented the results of quite a few benchmarks for the
- > sieving phase of GNFS on general numbers ranging from 30 to 90 digits.
-
- And you try to extrapolate by 45 digits from your highly suboptimal
- polynomial choices. You didn't even take Pollard's lattice sieve into
- account.
-
- I defy you to make a statement of the form ``GNFS will use more than G
- MIPS-years to factor RSA-129, while MPQS will take under M MIPS-years to
- factor RSA-129, and G > M,'' rather than hiding behind loose comparisons
- such as ``I estimate the crossover point to be around 135 digits.''
- Either make a definite statement so that I can demonstrate by actual
- experiments that you're wrong, or admit that you can't accurately
- estimate the time taken by GNFS.
-
- > Dan's labelling of detractors as 'pretending' is both insulting
- > and unprofessional.
-
- I don't think so. Your estimates of GNFS's speed have no more validity
- than Adleman's ridiculous estimates a year ago. They are based on
- wishful thinking (such as your incorrect estimate of coefficient digits
- for a 145-digit number on sci.crypt a few weeks ago) as well as neglect
- of existing algorithmic improvements (such as the special-q method).
-
- It was irresponsible of Adleman to state that it wasn't clear whether
- GNFS would be faster than MPQS for 330-digit numbers. It is just as
- irresponsible of you to claim a 135-digit crossover point. It is neither
- insulting nor unprofessional for me to demand that you make your
- estimates of GNFS speed sufficiently detailed that I can prove them
- false.
-
- > But he still lacks data on QS. Lenstra and Manasse have
- > done a few dozen numbers with QS. I've done in excess of 500.
-
- I can't speak for either Arjen Lenstra or Mark Manasse, but it seems to
- me that a few dozen numbers ranging up to 116 digits have far more
- relevance to 129-digit factorizations than several hundred wimpy
- numbers.
-
- ---Dan
-