OpenEuphoria

Re: Registering and copy protection

• Posted by Derek Parnell <ddparnell at bigpond.com> Oct 27, 2002
• 478 views

I have a Eu library to help with this. It is on the contributions page and
is called "encode.e".

I have an updated version that I'll send to RDS later today. It fixes up a
couple of weakness in the algorithm.

Basically it is a one-way encryption routine. The value generated cannot be
decrypted even if people have the algorithm.

You can specify the set of output characters to be used, the length of the
output and collating sequence of the input characters.

I'm using it it commercial software to protect passwords.
----------------
cheers,
Derek Parnell
----- Original Message -----
From: <rforno at tutopia.com>
To: "EUforum" <EUforum at topica.com>
Sent: Monday, October 28, 2002 3:24 AM
Subject: RE: Registering and copy protection


>
> Hi, Tony.
> I do not have programs on the net to be downloaded, except one for which I
> use a very particular scheme of protection linked to what the program
does,
> and so it is very difficult to crack. However, nobody asked for the
> program... :(.
> I think that if your program is not very popular, nobody will worry to
crack
> it, and so probably it is sure. You know that there are sites in the web
> that crack protections and offer serial numbers for free (others ask some
> payment), but they usually don't deal with unpopular programs.
> I think the best bet is to use a protection scheme developed at home,
> because then nobody will know the algorithm to crack it. For example, add
up
> all the bytes of the program, each one multiplied by an arbitrary factor
> taken from a sequence that, once used, is repeated as many times as
> necessary to cover the program length. Then encode the resulting number
base
> 36 (26 letters + 10 digits), for example, and use this as a serial number.
> You may see how to encode a number in my Euphoria package "general
> functions".
> Regards.
> ----- Original Message -----
> From: Tony Steward <lockmaster67 at aol.com>
> To: EUforum <EUforum at topica.com>
> Sent: Sunday, October 27, 2002 7:09 AM
> Subject: Registering and copy protection
>
>
> > Hi All,
> > I now that there is little one can do to totally prevent poeple from
> > riping of your software. I figure if it is registered and thier name or
> > company name is locked into the software, displayed on the screen and in
> > printouts.
> >
> > My Question is what ways are there to create registration numbers.
> > One apparently easy way is to use the crc file in the archives to create
> > a crc value for the name etc. But if this is a standard crc formula it
> > would be easy to crack. Then on the otherhand if somone is going to go
> > to this trouble then they will probably crack or patch the file anyway.
> > Just wondering what you all think and what methods you use to protect
> > your work. And if somone has created a library for this purpose.
> >
> > Thanks
> > Tony Steward
> >
> >
> > Give your hardest tasks to your lasiest workers.
> > They will always find the easiest way to complete it.
> >
> >
>
>
>