In BB84 quantum key distribution protocol

the security key is usually extracted from the measurement results of the system

but the actual system is vulnerable to attack. In basis encoding quantum key distribution protocol

the security key is based on the basis information

which does not need to be extracted by the measurement results. Compared with BB84 protocol

the basis encoding protocol does not change the hardware

and only needs to adjust the post-processing of the data. Therefore

the actual system is easy to implement. Aiming at the photon number splitting attack and the intercept-resend attack in the actual system

we analyze the actual security of basis coding protocol

BB84 protocol and B92 protocol. The results indicate that the basis coding protocol has better performance in fighting against the photon number splitting attack and the intercept-resend attack.