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yechen
yechen asked
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Last Modified: 2010-04-21
I have a flexlm license for 10 mouth,but I want to extended this  by modifiing the license data.I want to find a method to do this.Obvoisly this is not a legal method but I only want to try.
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Commented:
Normally, licenses are cryptographically signed,
and forging a cryptographic signature involves solving
a supposedly hard problem.
Maybe you will have a better chance
if you modify *date*, not data :)
I would advise you not to bother. Here's why:

In order to solve this puzzle you have to work out what the algorythm that generates the key is - not easy to do unless you are really good at reverse assembly.

Once you have solved the first puzzle you need to solve the alorythm for the number of licenses you want. Typicaly the algorythms used for this kind of problem are particularly hard to solve because they are what we call NP-Complete. That is to say solving this problem is just as hard as solving any of the classicaly hard problems like the 'travelling salesman' problem or any number of maze puzzles where the time to solve the problem grows faster than exponentialy with the complexity of the problem.

Althaugh I have not used flexLM, I assume that if it's a good system it will make use of exactly this kind of system to make it hard for you or I to break the protection. I'm afraid only a very unlikely lucky guess will be able to let you cheat the program.

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pxh

Commented:
This is highly illegal. However there is a way, which you can go for test purposes or in emergencies. I.e., assume your license server is down and you want to set up a different machine to do it.

If you want to know, ask.

pxh

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