The answer is
Pr0t3ct!on#cyber_security12*12.2011+
If you just type the hex code in, you get a DOS program. Run that and it prints a URL to a lump of JavaScript. Copying the output of the java program is a C program. You use the original matrix of values as inputs to the C program, and that runs a program, and tells you it’s done it, then the program hangs. If you look at the stack trace for the program (it appears to the computer that it’s crashed, and therefore you can look at what it left) and amongst that it says something positive and then the key above. I pasted it in and it worked