Foundations of Physics Letters

, Volume 19, Issue 3, pp 293–296

A Three-Stage Quantum Cryptography Protocol

Original Article

DOI: 10.1007/s10702-006-0520-9

Cite this article as:
Kak, S. Found Phys Lett (2006) 19: 293. doi:10.1007/s10702-006-0520-9


We present a three-stage quantum cryptographic protocol based on public key cryptography in which each party uses its own secret key. Unlike the BB84 protocol, where the qubits are transmitted in only one direction and classical information exchanged thereafter, the communication in the proposed protocol remains quantum in each stage. A related system of key distribution is also described.

Key words:

quantum information sciencequantum cryptographysecure communication protocol

Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  1. 1.Department of Electrical & Computer EngineeringLouisiana State UniversityBaton Rouge