Using Mac id Provide serial Key To windows application

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VB

please help for this.
i want generate serial key using Machine id (mac id) for licensing purpose .

Posted 30-Jan-12 7:19am

harishtaware

Updated 30-Jan-12 14:43pm

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Sergey Alexandrovich Kryukov 30-Jan-12 13:21pm

Not a question. Generate it if you want, you got my approval. :-)
What's the question? Your problem?

And please, use full capitalization, punctuation and correct spelling; this is a matter of elementary politeness.
--SA

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Dave Kreskowiak · Answer 1 · 2012-01-30T08:03:00

Solution 1

You cannot use the MAC address of a network adapter to guarantee a unique CD ID as MAC addresses are not unique.

Posted 30-Jan-12 8:03am

Dave Kreskowiak

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Clark Kent123 31-Jan-12 8:22am

MAC addresses are not unique? I always thought they were. Is it at least virtually unique? What are the odds that 2 network adapters having the same address (rhetorical just thinking out loud)?

Or do you mean that a person can change their MAC address thus violating it's uniqueness if it was unique to begin with?

Dave Kreskowiak 31-Jan-12 9:49am

MAC Addr's are most assuredly NOT unique. I know this because, many moons ago, I had two 3COM 3C509's on the same segment that were having all kinds of network problems. Until I just happened to glace at the MAC Addr bar code at the top of the cards. Yep, identical.

If you think about it, out of the 6 bytes of a MAC-48 address, the first 3 are used as a manufacturer code. The remaining 3 bytes are a sequence number in the production, giving you 16.5 million possible addresses. What are the chances a manufacturer is going to make more than 16.5 million Ethernet adapters??

You can have two adapters with the same MAC address on the same network, but NOT in the same segment. The MAC (or physical) address is what is used to communicate between two nodes on the same segment.

On top of that, yes, you can change the MAC address of certain adapters, thereby opening yourself up to spoofing and physical address collisions.

Clark Kent123 31-Jan-12 10:16am

I see your point. I didn't realize all that. You learn something new everyday. Thanks for the clarification! :)

Clark Kent123 · Answer 2 · 2012-01-31T02:30:00

First I would like to say that I mean no disrespect about what I am about to say. But code project has a great search function in the upper right hand corner. I just typed in "licensing" and I got these great articles.

Cryptography 101 for the .NET Framework[^]

License Key Generation[^]

May these can help you? Take a look and let me know.

One last thing I would like to mention it's hard helping someone if they give you little information. Wish you all the best.

Keep on coding! :)