QUANTUM CRYPTOGRAPHY – EXPLORING THE APPLICABILITY OF BB84 AND EPR ALGORITHMS IN ENHANCING THE QKD

Divyashi Agrawal

Vol. 4, Jan-Dec 2018

Page Number: 109-118

Abstract:

Today secure communications are increasingly more important to the intended communicators without being intercepted by eavesdroppers. Quantum cryptography promises to revolutionize the key distribution problem in cryptographic system by providing a secure communication channel between two parties with high security guaranteed by the fundamental laws of the physics. Quantum cryptography provides the solution that uses property of polarization to ensure that transmitted data is not disturbed. Basic protocols for QKD provide maximum 25% (B92 protocol) and 50% (BB84 and EPR) idealized efficiency receptively, which is not enough for secure transmission of shared key. This work provides the mechanism that enhances the data security in quantum cryptography during exchange of information by increasing the size of shared key up to 75%. The identity verification mechanism tries to provide maximum success for explanation of Quantum key distribution’s EPR protocol is given. Using the EPR method, Alice and Bob could potentially store the prepared entangled particles and then measure them and create the key just going to use it, eliminating the problem of insecure storage. In the Next phase, proposed mechanism is described. The proposed mechanism combines EPR protocol at two stages, (1) from sender to receiver and then (2) from receiver to sender. Doubling EPR protocol enhances information reconciliation as well as privacy amplification. In future the proposed mechanism will be very beneficial where unconditional security is required during key and other secret information exchange.

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