A Quantum Key Distribution Protocol

摘要

The distribution of keys is a major weakness of private key cryptography. Quantum cryptography originally presented in BB84 protocol, overcomes this drawback by providing a secure way of sharing a random key between two separate parties. In this paper a key distribution protocol based on the concepts of BB84 is proposed It provides an additional layer of security by sending the key data bits twice ; during the second transmission the original key bits or their complements are randomly chosen for transmission. The sender informs the receiver about the orientation of the key bits during the second round of transmission only after the data has been sent out.