Finding invertible permutation functions

Sarad AV jtrjtrjtr2001 at yahoo.com
Mon Apr 14 03:56:45 PDT 2008


it's not for any grad course but lets cut a deal. i
will send you free turkey and beer for every post
where you don't bring this up :-)

--- Tyler Durden <camera_lumina at hotmail.com> wrote:

> 
> Dude:
> Just how long will you continue taking Grad courses?
> Hasn't it been like 10 years already?
> 
> And I repeat: Cypherpunks deserves a permanent cut
> of your post-grad income. I say 10% will do...
> 
> -TD
> 
> 
> 
> > Date: Tue, 18 Mar 2008 13:59:36 -0700
> > From: jtrjtrjtr2001 at yahoo.com
> > Subject: Finding invertible permutation functions
> > To: cypherpunks at al-qaeda.net
> > 
> > hi,
> > 
> > I am looking at single cycle, invertible
> permutation
> > functions of the form
> > x ->  x+ (x^2 V C)  (mod 2^n), where V is a
> bitwise OR
> > and C is a special constant.
> > This function is as given in the url below
> > http://citeseer.ist.psu.edu/klimov02new.html
> > 
> > Would like to find the inverse permutation
> function
> > for it but the paper only shows that the above
> > function is provably invertible.
> > 
> > Are  there any construction methods for finding
> > inverse permutation function, for a single cycle
> > invertible function f?
> > 
> > Thanks,
> > Sarad.
> > 
> > 
> >      
>
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> 
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