This program is used to crypt and decrypt files.

Windows binary can be found in the releases section.

Here is a video on YouTube: https://www.youtube.com/watch?v=-3_Q7j0UqKE

Basically, it takes a file and swaps 1st, 3rd and so on bits to their opposite (0 -> 1 and 1 -> 0).

gcc -std=gnu11 ncrpt_*.c -o ncrpt_*.exe

Don't forget to replace * with mapping or direct

You can use -std=c99 instead. Also, you can add -DNO_PROGRESS (direct only) flag to turn off printing current progress.