The problem is that the RSA algorithm is not suitable for this. The correct way to generate license keys is to use digital signatures and public/private key encryption. License Key Generation Using Digital Signature Algorithms These methods are incorrect and weak, and if a malicious party is really interested in your application the decryption keys or decoding/encoding algorithm will be extracted from your application in a matter of days since release. Many developers resort to hiding an obscure key generation and validation algorithm into the application, or encrypting a license key with a symmetrical encryption algorithm, and then hiding the encryption/decryption key into the application for license key decryption and validation. Only you or your company should be able to generate license keys, and you must be able to enforce using each license key on one computer (or a number of computers that you choose).
License management is the most important aspect of making money out of a software application. Step 1: Implement correct license management Complete working samples written in both C# and VB.NET are attached to this article. Net applications with zero or few investments. Instead, it teaches you the basic principles of copy protection, and then it shows how to efficiently use free (or very cheap) tools such that you can achieve a decent degree of copy protection for your. This article does not teach you to reinvent the wheel and implement your own copy protection techniques from scratch.
While it is true that perfect software copy protection is almost a dream given today's operating system and hardware infrastructure, if you are careful and use the right tools and techniques you can achieve a good degree of protection for your applications. Software copy protection is a never-ending topic among developers.
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