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16k - A Simple Passive Keystroke Logger
There are several approaches to writing keystroke loggers (system wide hooks, kernel-based, passive monitoring). 16k demonstrates a simple passive approach to writing keystroke loggers for Windows based systems and is intended for educational purposes only. 16k logs pressed keys, mouse clicks, and the active window during that input event as well as time and state (key up or down) in an effort to correct common input issues. To compile 16k, you'll need a modern C++ compiler (I use mingw and msys), boost C++ libraries and a Windows PC. Compile and linking instructions are in the source code. 16k runs on Windows XP or newer Windows operating systems. 16k is distributed under the terms of the GNU General Public License.
Depending on your location, it may be illegal to use or store 16k on multi-user systems without the knowledge and consent of all users. And even then, it may still be illegal. If you have doubts about legality, consult a lawyer.