Quantum key distribution series network protocol with M-classical Bobs

Secure key distribution among classical parties is impossibleboth between two parties and in a network. In this paper, wepresent a quantum key distribution (QKD) protocol to distributesecure key bits among one quantum party and numerous classicalparties who have no quantum capacity. We prove that our protocol iscompletely robust, i.e., any eavesdropping attack should be detectedwith nonzero probability. Our calculations show that our protocolmay be secure against Eve's symmetrically individual attack.