Hi
Can anyone point me in the right direction to find some encryption routines
/ algorithms for use with product licensing??

I want to pull data such as the computer name etc etc, and encrypt them
against a string of mine, which will then create a product key.

Does anyone have a piece of code to do this, or any type of encryption that
may be useful in .NET

Thanks


Paul

There are a lot of possibilities.

This is one of them.

Collect some informations (that rarely change) from client ex.: Computer
Name, Network MAC Address, ... and concatenate them into a string.
(ss="PCNAMEAB0F45DC")

Computete Hash Code:
System.Security.Cryptography.SHA1
h=System.Security.Cryptography.SHA1.Create();
byte[] bb=h.ComputeHash(System.Text.UnicodeEncoding.Unicode.GetBytes(ss));
Convert this binary result into hexadecimal string (323426534213423 ==>
XXXXXXXXXXXXXXXX).

Group into small piece if you want (XXXX-XXXX-XXXX-XXXX).

Andrea.



Show quoteHide quote

What do you mean by "encrypt them against a string of mine"?  You are
going to provide a key (string) and use that to encrypt your data?
Where would that key be stored?  In the binary? That's not too secure.

You should think long and hard before you implement any form of
licensing youself that uses product activation (ie locks the license to
a single PC).   Unless you have only a very few customers or else have
enough resources to offer 24/7 email and phone support then I would
look at some of the commercial products (xheo, xenocode etc) that do
this type of licensing and can provide that level of support.

Our company offers a simpler encrypted licensing solution because we
believe that product activation is actually a bad business model - see
our web page for the reasons why (www.infralution.com/licensing.html)

Regards
Grant Frisken

strong naming fails if delay signed
When does a Windows Form create it's message processing thread
CLR Bug ?!
GUID for .Net framework
GenericPrincipal serialization.
Release date for .NET 2.0
on_Windows_98
Including MSDE in Windows package, containing C# app
Protecting code
Update for .NET Framework - "you can't get there from here"