Cryptanalysis

Hey,

I’m stuck at the end of the challenge.

I got the seed and so, the key, but when i use thoses keys to decrypt the cipher, I have nothing.
I just have a bz2 file that is corrupted..

I feel that i’m very close to the end and that the end is stupid but i’m hard-stuck...

Can someone help me ?

Use the CrypTool program (Windows)
It solved my problem