给出了六态扩展BB84协议的Breidbart基窃听方案 ,分析并计算了各种截取 重发策略下的Alice Eve平均交互信息量和施行QKD标准纠错手续后的有效平均交互信息量 ,结果显示Breidbart基窃听 Breidbart基重发策略 (B B策略 )最为有效 .考虑到Alice和Bob可以在公开讨论阶段利用废弃数据检验是否存在B B窃听以降低秘密性增强算法的强度 ,减少量子密钥的损失 ,提出了修改BB84协议的建议 .给出了可能较QKD标准纠错手续更为安全的量子密钥二次生成纠错方法 The Breidbart-based eavesdropping scheme with six-state extended BB84 protocol is given, and the average amount of Alice Eve interaction information and the effective average mutual information after QKD standard error correction procedures are analyzed and calculated. The results show that Breidbart Based on Brexbart retransmission strategy (BB strategy) is most effective.Considering the Alice and Bob can use the discarded data in the open discussion stage to test whether there is BB tapping to reduce the secret to enhance the strength of the algorithm, reduce the quantum key loss, proposed Modification of the BB84 protocol Recommendations Quantum key generation error correction methods that may be more secure than QKD standard error correction procedures