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Abstract

Abstract
Quantum Key Distribution QKD mechanism is based on the principles of quantum mechanics to guarantee the secure exchange of secret keys between users. In this paper, the BB84 protocol is simulated, and the enhancement of the protocol using multi-parity instead of single parity is introduced with the error correction unit.The sub-blocklength is changed dynamically in an adaptive way and according to the QBER values, also this study takes into account the channel effect on the protocol by applying four types of channels (perfect channel, low noise channel, medium noise channel and high noise channel) and all channels are assumed to be lossless.The study includes also the effect of three types of attacks (PNS, IR, PNS & IR attacks) onto the protocol performance.The simulation results show that (IR) attack have the strongest effect on the BB84 performance.
Keywords : BB84, QKD, Multi-Parity, Quantum Cryptography, Security, PNS, IR, PNS & IR, attack.

Keywords