Re: [Sip] question about "Computational Puzzles for SPAM Reduction in SIP"

Hmm, that seems strange. It would be good to figure this out. Did I specify
the puzzles incorrectly? If this is a problem with the draft, this is the
right place to sort it out, if it turns out to just be an implementation
issues, we might want to move the thread to sip-implementers

On 9/27/05 1:31 AM, "Geoffrey Dawirs" <gdawirs@gmail.com> wrote:

> Hello,
> 
> I'm a student from Belgium, and I'm very interested with the problem
> of SPAM, especially in SIP. My english is not very good, sorry for my
> mistakes...
> 
> I've tried to implement the algorithm given in the draft
> "Computational Puzzles for SPAM Reduction in SIP"
> (draft-jennings-sip-hashcash-02.txt), to see what's happening when the
> "work" value defined in the document increases or decreases.
> 
> My problem is that my program CANNOT find solutions when "work" is too large.
> When (work <= 8) my program always finds a solution to the puzzle.
> When work==9 my program finds a solution with a probability of about 50%
> With work==10 this probability falls: about 30%
> With work==11... about 15%
> ...
> 
> I don't understand why, with larger values for "work", my program
> finds more rarely the solution of the Puzzle...
> 
> The draft says that when the UAC reveives a "bad" puzzle and thus when
> the UAC cannot find the solution of the puzzle, he must consider the
> "419 Puzzle required" as an error message. But my errors are too
> frequent to consider a large percentage of challenges as errors!!!
> 
> Does somebody has tried to implement this draft?
> Do you get the same result as me?
> 
> Thank you very much, best regards,
> Geoffrey Dawirs
> 
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