Use online update to block those unlicensed copies. Verify serial number from different modules of your application and do not use a single function call to do the verification (so that crackers cannot bypass the verification easily). Not only check serial number at startup, do the verification while saving data, do it every Friday evening, do it when user is idle ... Verify application file check sum, store your security check sum in different places. Don't go too far on these kind of tricks, make sure your application never crash/get into malfunction while verifying registration code. Build a useful app for users is much more important than make a unbreakable binary for crackers.

使用Skater . net混淆器。该. net保护工具针对de4dot, de4dot是一个去混淆器，它将原始受保护的程序集成员名称重命名为人类可读的字符串。溜冰者与之对抗!

最近，MindSystemm集团发布了一个名为Skater的特殊工具。NetDeobfuscator [url: https://github.com/MindSystemm/Skater.NetDeobfuscator]，它利用了Skater. net混淆器的漏洞。 混淆器的开发者Rustemsoft LLC收到了一个迫切需要保护关键的Skater . net混淆器算法和软件基础设施的信号，以便为Skater用户提供更强的源代码保护。这个问题已经解决了。

你和很多人分享的秘密就不是秘密了。如果你的代码中有秘密的东西，混淆它是没有保护的;它只需要去混淆一次。如果你有什么秘密不想和你的客户分享，那就不要和你的客户分享。将代码编写为web服务，并将超级机密代码保存在自己的服务器上，只有您可以看到它。

只需编写一个好的应用程序和一个简单的保护系统。不管你选择什么保护，它都会被逆转……所以不要浪费太多时间/金钱。

如果它是用。net编写并编译为CIL，则可以反映出来。如果安全性是一个问题，并且要避免混淆，那么我建议使用非托管语言编写应用程序，这种语言本质上更难以进行逆向工程。

你无法阻止别人破解你的软件。

However, you can make them create cracks that will hurt your sales less. Keygenerators that can issue a valid registration code for your software are much worse than simple patches that remove registration incentives from your software. That's because a crack will work for one software version only, and will cease to work with the next software update you release. The keygenerator will continue to work until you change your registration key algorithm and that's something you don't want to do often because it will put off your honest clients.

因此，如果您正在寻找一种方法来对抗非法的密钥生成器，并且您不想使用不对称加密，因为这会生成很长的注册码，您可以看看部分密钥验证。

Partial Key Verification makes sure that each illegal keygenerator works only for one particular release of your software. Basically what you do is to make sure that each release of your software only links with the code for checking SOME digits of the registration code. Which digits exactly is random, so crackers would have to reverse engineer many different versions of your software and combine all this into one keygenerator in order to release a keygenerator that works for all versions of your software.

如果你定期发布新的软件版本，这将导致大量的密钥生成器散布在各种软件盗版档案中，这些文件不再工作。潜在的软件盗版者通常会寻找最新版本的破解或关键元素，所以他们可能会尝试其中的一些，并最终放弃。

我在我的(c++)新共享游戏中使用了部分密钥验证，它非常有效。之前我们遇到了很多无法对抗的关键生成器问题。后来出现了许多漏洞，一些按键生成器只适用于特定版本的游戏，但没有一个按键生成器适用于所有版本。我们定期发布游戏的小更新，让之前存在的所有漏洞都变得无用。

似乎有一个用于部分密钥验证的开源。net框架，尽管我还没有尝试过。