  Using the previously shared Einstein-Podolsky-Rosen pairs, a proposal which
can be used to distribute a quantum key and identify the user's identification
simultaneously is presented. In this scheme, two local unitary operations and
the Bell state measurement are used. Combined with quantum memories, a
cryptographic network is proposed. One advantage is no classical communication
is needed, which make the scheme more secure. The secure analysis of this
scheme is shown.
