An Offline Product Activation Demo Built from Scratch.
- Microsoft Windows Vista or later
- .Net Framework 3.5 or later
- Key-gen
- Computing MachineID
- Creating signature (license) based on MachineID using private key
- Verifying signature using public key
- Helper functions for transferring code offline
- Using 256-bit ECDSA, which is an overkill for such apps (I believe Micorosft is using some 64-bit Elliptic Curve Signature Algorithm in Windows and Office Activation), while should be quite safe in the next decade.
- If you are port the code to another platform, consider 112-bit key to shorten the signature
- Product Activation Mechanism does not protected your software against cracking
- Use
ECC_Key_Gen.exeto create keys - Use
PA_Public.exeto get your MachineID - use
PA_Private.exe <MachineID>to create signature for client - Use
PA_Public.exe <Signature_in_Base64>to verify signature
Source code is released under MIT License.