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I am looking simple encryption functionality for my company's products. I am not looking for complicated encryptions. Just simple keys to keep things okay for both side, my company and customers. Company will have C# application to produce keys, then we will send keys to customers. When user opened key producer application, he/she will select products we sold, and type customer key. And program will produce the key. 

Customer id is an integer of 6 characters. (Example: 103499)

Product id are string(can be both integer and char) of 4 characters.(Example: PRD3)

Also program will have an expiration date. (Example: 10/10/2013)

Once customers enter this key, product updates itself to use enabled function in the key.

I don't have much information about encryption, so i would appreciate your help.

Regards

Alasse
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    You can use aes encryption. Takea look [here][1] [1]: http://stackoverflow.com/questions/273452/using-aes-encryption-in-c-sharp – Tinwor Jul 24 '13 at 14:55
  • The keys are pretty short. What prevents users from trying keys in order until a valid one is found? – ntoskrnl Jul 24 '13 at 15:10
  • @ntoskrnl customer and special product ids will be entered at our side.After the encryption,the customer will recieve long key.Customer wont be able to see customer id and special product id. – Alasse Jul 24 '13 at 15:39
  • @user220255 thanks aes encryption worked really well. – Alasse Jul 25 '13 at 07:20

2 Answers2

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You can use a public/private key method, this way you'll have a public key and the product key will act as the private one.

This article should be a good start: http://msdn.microsoft.com/en-us/library/5e9ft273.aspx

bateloche
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I decided making it with AES encryption and it worked well for my purpose. Thanks for your asistance!

I used Using AES encryption in C# topic as reference.

Community
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Alasse
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