You are here: home > resources > cyoprotect

description

CyoProtect is a free software protection system for Windows developers that prevents the modification of compiled C++ programs.

It is currently only intended for use with Microsoft Visual C++ applications.

It comes with one executable, one C++ header, and three static libraries (for single-threaded, multi-threaded, and multi-threaded DLL runtime linking).

usage

Using CyoProtect is simple if you follow these steps:

Download

• Download CyoProtect.zip, unzip to e.g. C:\CyoProtect, and add this folder to the PATH.

Integrate

• #include "CyoProtect.h" in your application's code;
• Make a call to "CyoProtect_Verify()" from within your code - e.g. InitInstance(), main(), or WinMain(). If the return value is 0 (zero), then the compiled exe has been modified: terminate the application;
• Link with one of the three libraries (MFC applications would probably use the 'multi-threaded DLL' library).

Compile

• Compile your application;
• Execute CyoProtect (within the Post-Build Event) to protect the compiled exe - e.g. use a command such as:
  CyoProtect.exe "/file=$(TargetPath)" /silent

Test

• In a hex editor, load your application's executable;
• Modify a resource string, compiled code, or other data (being careful not to corrupt the exe to prevent it from working!);
• Execute your application (the program will detect the modification and terminate).

security warning

Note that CyoProtect is not 100% secure; it should protect against the average C/C++ or VB programmer, but will certainly not protect against competent hackers and crackers - but then, what does?!

current release

Version 1.0.0 - 4th November 2003

download

Download the CyoProtect executable and libraries here (211 KB)