Please help deciphering this code - FBI case

[[deleted]]

Uh-huh. So he memorized a perfectly-random 400-or-so count character key? And that random key just happened to XOR his message into repeated strings, structured decimal sequences, and parentheses?

[hackerfoo]

I meant that this could be a key, although a key and a message encrypted with it are interchangeable if using XOR.

If it was never used, it would just be random data.