Classic variant from
groundzer0, in my uninitiated opinion, seems to be more convenient, because here images are decrypted once and for all (after all, they can be simply viewed through usual software like XnView MP), while in second solution, as I understood, user managed to pick up encryption key, which decrypts encrypted images on the fly. But how such "on-the-fly decryption" will work (and whether it will work), for example, when opening an extra scene via the Game Gallery, is an open question.