Phase key, which uses optical encoding techniques for system security, plays an important role in optical storage, optical communication, and optical display. It employs a random phase generator with a volume hologram for optical encoding. The advantages of using phase keys for optical communication is: (1) it is hard to be duplicated and (2) it requires sensitively alignment to decode the desired signal. Thus, it ensures security of the optical system. However, the adjunctive challenge of using a phase key is the difficulty of alignment by users. In this paper, we propose a method for optical alignment of the phase key in a random phase encoded volume holographic storage system. In this method, a holographic correlator is applied to help the optical alignment of the phase key. It has been shown that the desired signal from the random phase encoded volume holographic storage system can be retrieved easily with high security.