Solutions: The Hex Factor v2011 (level C100)

The C100, the easiest of the Binary Challenges. You can find the binary for download here.

Solving this one (should be ;-)) quite easy. You don't need to reverse the code, but just look at the strings present in the binary file.

There is one minor difficulty however. While the strings of this program are ASCII strings, the password is stored in Unicode. So you have to make sure that the tool you use to display strings in a binary file, also looks for Unicode strings. Like bintext:

Looking at the strings in this dump, you should be able to see that OpenSesame was the password we were looking for.