The only thing "crypted" is maybe the Eboot.bin, if the Boot.bin is full of 0's that's quite normal since it's not used (and they are the same)
Use any hex editor and open your Eboot.bin, if you see ~PSP
then it's crypted, and you have to use something (don't remember the name so google for it)
Then, your data are the usrdir as stated.
And you didn't choose a difficult project, you just haven't learn: