Protecting your Dlls

Question

Hi guys Do you know how i can protect any dll's i write in c# from external use. I want any project in my solution to be able to reference any other project in the solution and use the functions in the assembly. But i don't want any outside applications to use the dlls. Any ideas on how to do this.

mibuyt · Answer

Hi. 1. Look into Code Access Security. 2. Is best if you can obfuscate your assembly? Even though it is true you can disassemble it it still will be harder. Cheers.

trolik · Answer

Hi! You can look at StrongNameIdentityPermission attribute which you can apply to method class or assembly. For example: [System.Security.Permissions.StrongNameIdentityPermission(SecurityAction.LinkDemand PublicKey=00240000...D4)] public void test() {} When method test is running (for this example when method body JIT-ed) framework check if caller assembly is signed and public key is valid. If not then SecurityExcaption thrown. But remember what anybody can disassemble you .dll remove attributes and compile .dll again