Three-Party Authenticated Quantum Key Distribution Protocol with Time Constraint

The quantum cryptographic key assignment problem is getting important in an optic network, when it is to assign cryptographic keys to each of communication parties via insecure optic channel. In this paper, we propose Three-Party Authenticated Quantum Key Distribution Protocol with Time-Bound (3PAQKD-TB). Each session key corresponding to the measurement bases dynamically changed for each time-period, which is belonging to the intersection set from both two parties´ negotiated time bounds. In the constraint time-periods, the session key will be changed at each time-period. Both parties will generate the different polarization quantum states at each time-period. Therefore, the eavesdropper cannot guess easily the bases.