Facts we know:
There are 160 characters
Characters are lined on a grid, each square containing two characters
Characters vary from letters to numbers
Answer is 1-16 characters long
Edit:
Oh wow look this seems easier than it should be.
Grid is 10 x 16
So there's an equal number of 6 characters in a set
Characters are either 1-9 or a-f
Hex codes run on all of this.
Also, the hex code they give you converts to x86 machine code that can be run on your computer.
So when you put it in, does it give you an image of the keyword or something?