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A two-factor identity authentication method
on the basis of two-beam interference was presented. While verifying a user’s
identity, a specific “phase key” as well as a corresponding “phase lock” are
both mandatory required for a successful authentication. Note that this scheme
can not only check the legality of the users, but also verify their identity
levels so as to grant them hierarchical access permissions to various resources
of the protected systems or organizations. The authentication process is
straightforward and could be implemented by a hybrid optic-electrical system.
However, the system designing procedure involves an iterative Modified Phase
Retrieval Algorithm (MPRA) and can only be achieved by digital means.
Theoretical analysis and simulations both validate the effectiveness of our