This Github project has been superseded by Github project cascadecpp, which is a port of the Python code in this repository to C++. The C++ code runs about 100x faster because C++ is faster than Python but mostly because the C++ code has been much more heavily optimized. Also, the C++ code is more reliable because it has been more carefully debugged. I recommend that you read the documentation in the link below for an introduction to the Cascade algorithm. But when it comes to running code, I recommend the C++ code over the Python code.
Cascade information reconciliation protocol for Quantum Key Distribution (QKD).
See documentation.