Improving BB84 in Quantum Encryption

Today, information security plays a key role in communications and exchanges.Until now Various approaches including: Quantum encryption and Quantum key Distribution (QKD), have been utilized for information security, that act based on Quantum Mechanic principles, so that if one tries to hear the information, it will be detected via increasing error rate in receiver part. BB84 is one of secure algorithms in quantum encryption area, bearing less error rate in comparison to other quantum algorithms. The goal of the paper is to improve the algorithms as much as possible in order to defend the attacks. We use a hybrid key to accomplish the task in which we add authentication and time limit beside the QKD key.