license key validation - encryption/decryption

[John Gorman]

... Then pick up a copy of "Secrets and Lies" by Schneier, published in 
2000 by Wiley and find out what his current perspective is.  The preface 
starts out, "I have written this book partly to correct a mistake." 
Schneier then goes on to describe a plethora of problems that arise in 
electronic security.  Key management is definitely a problem.
-JG

Markus Schaber wrote:

> Hi,
> 
> On Mon, 3 Dec 2001 21:25:16 -0800 (PST)
> Rock VZ <rockvz at yahoo.com> wrote:
> 
> 
>>How do i generate this "encrypted license key" for
>>different features for different customers?
>>
>>How do i validate it at the customer site that the
>>"key" installed is valid?
>>
> 
> Independently of the language and the file format, you should read a good book about cryptography. 
> 
> "Bruce Schneier: Applied Cryptography" is known to be one of the best books about this subject.
> 
> markus
>