Sorry... =)

Sorry for last post about "secret key". The final information is that this key is for encrypting RAM disk.

openssl enc -d -in ramdisk.dmg -out de.dmg -aes-128-cbc -K 188458A6D15034DFE386F23B61D43774 -iv 0

If you enter this comand, you will encrypte RAM disk in all firmawares from 1.1.1

P.S. IMHO picture "Pass" is from RAM disk...