This is a port of the original Linux x86 IOLI crackme binaries to x86-64. The original set of IOLI crackmes can be found here: https://github.com/Maijin/radare2-workshop-2015/tree/master/IOLI-crackme.

The original 32-bit binaries were built with GCC 3.4.6 on a Gentoo box:

• GCC: (GNU) 3.4.6 (Gentoo 3.4.6-r2, ssp-3.4.6-1.0, pie-8.7.10)

The ported 64-bit binaries were built with GCC 9.3.0 on an Ubuntu machine (see the makefile for more info):

• GCC: (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0

An approximation of the source code of the original IOLI binaries was created with the help of Ghidra, gef and various write-ups. Aside from a few errors or deviations here and there, the the x86-64 binaries' behavior at runtime should closely resemble that of the originals. These binaries are relatively simple and well understood, so they should still be useful for learning x86-64 reverse engineering and/or how to use new tools.

Example use cases of the source code in this repository:

• assisting newcomers to reverse engineering with understanding disassembled machine code
• the source code can be modified to create new crackme variants
• a different compiler toolchain such as Clang can be used to build the binaries instead of GCC
• these programs can be built to target other architectures such as MIPS or ARM

Enjoy.