我一直在思考如何保护我的C/ c++代码不被反汇编和逆向工程破坏。通常情况下，在我的代码中，我绝不会宽恕这种行为;然而，为了各种人的安全，我目前正在研究的协议决不能被检查或理解。
现在这对我来说是一个新的主题，互联网并没有真正的资源来防止逆向工程，而是描述了大量关于如何逆向工程的信息
到目前为止我想到的一些事情是:
Code injection (calling dummy functions before and after actual function calls)
Code obfustication (mangles the disassembly of the binary)
Write my own startup routines (harder for debuggers to bind to)
void startup();
int _start()
{
startup( );
exit (0)
}
void startup()
{
/* code here */
}
Runtime check for debuggers (and force exit if detected)
Function trampolines
void trampoline(void (*fnptr)(), bool ping = false)
{
if(ping)
fnptr();
else
trampoline(fnptr, true);
}
Pointless allocations and deallocations (stack changes a lot)
Pointless dummy calls and trampolines (tons of jumping in disassembly output)
Tons of casting (for obfuscated disassembly)
我的意思是，这些是我想过的一些事情，但它们都可以在适当的时间框架内由代码分析师解决。我还有别的选择吗?
正如很多人已经说过的:在一个普通的CPU上，你不能阻止它们，你只能延迟它们。就像我以前的密码学老师告诉我的那样:你不需要完美的加密，破解密码的代价肯定比获得的代价更大。你的困惑也是一样。
但还有3个注意事项:
It is possible to make reverse engineering impossible, BUT (and this is a very very big but), you cant do it on a conventional cpu. I did also much hardware development, and often FPGA are used. E.g. the Virtex 5 FX have a PowerPC CPU on them, and you can use the APU to implement own CPU opcodes in your hardware. You could use this facility to really decrypt incstuctions for the PowerPC, that is not accessible by the outside or other software, or even execute the command in the hardware. As the FPGA has builtin AES encryption for its configuration bitstream, you could not reverse engineer it (except someone manages to break AES, but then I guess we have other problems...). This ways vendors of hardware IP also protect their work.
You speak from protocol. You dont say what kind of protocol it is, but when it is a network protocol you should at least protect it against network sniffing. This can you indeed do by encryption. But if you want to protect the en/decryption from an owner of the software, you are back to the obfuscation.
Do make your programm undebuggable/unrunnable. Try to use some kind of detection of debugging and apply it e.g. in some formula oder adding a debug register content to a magic constant. It is much harder if your program looks in debug mode is if it where running normal, but makes a complete wrong computation, operation, or some other. E.g. I know some eco games, that had a really nasty copy-protection (I know you dont want copyprotection, but it is similar): The stolen version altered the mined resources after 30 mins of game play, and suddenly you got just a single resource. The pirate just cracked it (i.e. reverse engineered it) - checked if it run, and volia released it. Such slight behaviour changings are very hard to detect, esp. if they do not appear instantly to detection, but only delayed.
所以最后我想建议:
估算逆向工程人员的收益，将其转化为一些时间(例如，使用最便宜的印度工资)，并进行逆向工程，使时间成本更大。
安布尔说的完全正确。你可以让逆向工程变得更难，但你永远无法阻止它。永远不要相信依赖于防止逆向工程的“安全性”。
That said, the best anti-reverse-engineering techniques that I've seen focused not on obfuscating the code, but instead on breaking the tools that people usually use to understand how code works. Finding creative ways to break disassemblers, debuggers, etc is both likely to be more effective and also more intellectually satisfying than just generating reams of horrible spaghetti code. This does nothing to block a determined attacker, but it does increase the likelihood that J Random Cracker will wander off and work on something easier instead.
通过不公开来保证安全并不像比他聪明得多的人所证明的那样有效
我们两个。如果你必须保护你的客户的通信协议，那么你是
道德上有义务使用最好的代码，这些代码是公开的，并由专家全面审查。
这适用于人们可以检查代码的情况。如果您的应用程序是在嵌入式微处理器上运行的，那么您可以选择一个具有密封功能的微处理器，这使得在运行时不可能检查代码或观察更多的琐碎参数，例如当前使用情况。(是的，除了硬件入侵技术，你要小心地拆卸芯片，使用先进的设备来检查单个晶体管上的电流。)
我是x86逆向工程汇编程序的作者。如果你准备感冒的话
惊喜，寄给我你竭尽全力的结果。(通过我的网站联系我。)
在我所看到的答案中，很少有人会给我带来实质性的障碍。如果你想看的话
如何复杂的逆向工程代码工作，你真的应该研究网站
逆向工程挑战。
你的问题需要澄清一下。你怎么能保守协议的秘密，如果
计算机代码可以进行逆向工程吗?如果我的协议是发送一个RSA加密消息(甚至是公钥)，通过保持协议的秘密，你能得到什么?
出于所有实际目的，检查器将面对一系列随机比特。
问候阿尔伯特
