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Editorial Team
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Asked: 2026-05-25T01:39:41+00:00

I am facing a rather odd problem right now. If you fellow this :

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I am facing a rather odd problem right now. If you fellow this : Best place to put key or password used for encryption? i was looking at a way to encrypt data. Using RSA seemed to be a good choice. However we have a problem since my requirements are thoses fellowing…

  • Client must have a file encrypted in order to determine if the software is activated.

That actually mean that the client must read the encrypted file.. but the problem is that we actually need the private key to be there which isnt a good idea since some poeple could start making their license file using that key. The activation server encrypt the data file which are sent back to the client and then the client save that file.

What are the best way to solve this problem ?

So what i am looking for exactly is a way for thoses requirements …

  • Client must have a file encrypted in order to determine if the software is activated.
  • Client sent user data to the activation server in unencrypted/encrypted form. That doesnt matter. Sure it would be better encrypted at this point.
  • The activation server check that data and then determine if the client can be activated.
  • If the client can be activated then the server send the encrypted form of the license file.. but the problem appear now.. there is no way to deencrypt the file on the client if the private key isnt on the client which would be pretty insecure!

Any ideas ?

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1 Answer

  1. Editorial Team

    I think you should have a look to digital signatures : http://www.codeproject.com/KB/security/xmldsiglic.aspx seems to be a good answer to your question.

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