Re: Cracks/Key Generators

From: karan (karan_at_iitk.ac.in)
Date: 10/20/04 

Date: 20 Oct 2004 07:00:52 -0700

roberson@ibd.nrc-cnrc.gc.ca (Walter Roberson) wrote in message news:<cl525m$j0u$1@canopus.cc.umanitoba.ca>...
> In article <547d92f1.0410192201.7b98af71@posting.google.com>,
> karan <karan@iitk.ac.in> wrote:
> :How does one make a crack/Keygenerator?
> :How do they work?
> :How can a software key - check be made fool proof?
>
> The only way to make a software key-check "fool proof" is to use
> a one-time-pad to encrypt the program, with the pad being at least
> as large as the program itself, and the one-time-pad being discarded
> after a single use, thus requiring a new copy of the program
> for every invocation. Every other mechanism can be broken,
> by brute force if necessary.
>
> Note that I am making the assumption here that when you say
> "fool proof" that you mean that it is literally impossible to
> bypass the control mechanisms without having been given the
> key.
>
> I am also making the assumption that the Universe will
> last indefinitely long in a form that permits computations to
> proceed.
>
> Furthermore I am assuming that the program is not so long
> as to require every possible storage state in the Universe.
> And even if it does occupy every possible storage state,
> I wouldn't want to promise that the program would be impossible
> to break, as there's probably a way to do computation using
> virtual particles as temporary storage -- I don't recall scientists
> having found any limit on the number of virtual particles that
> can exist simultaneously.
>
>
> Now, if you'd been willing to settle for a software check that would
> only take on average 100 or so trillion years to break, then my
> would have been rather different. Most people would be satisfied
> if their protection mechanism would probably last until Sol went
> nova and expanded to be large enough that Terra's current orbit would
> lie within the solar atmosphere. But such protection could not be
> called "fool proof", merely "somewhat fool-resistant."

>>>>>>>>>>>>>>"somewhat fool-resistant."
Yes, probably for the amount of time it takes for a hacker to be old
enough that he cant type anymore :)

Well,please elucidiate now that the question is clear.I have no
knowledge of cracks/keygens etc. How do they work?? Can it be
prevented?

In reference to your previous post , what is a 'pad'?

Thanks,
Karan