they use the same key of "Top Race Simulador 2009" that you can see when you launch the tool without arguments:
Code:
-k KEYN specify a keynum value different than the default one (0x000b2023)
keynum is the NEEDED encryption number which is game dependent:
0 rFator
0x000b2023 Arca Sim Racing
0x000b2023 ACTC Simulador Turismo Carretera
0x000dfc2a Top Race Simulador 2009
0x0001be0b Superleague Formula
indeed it's enough to use the following command to decrypt them perfectly:
Code:
rfactorgmdec -k 0x000dfc2a goma.tbc goma.tbc.decrypted