Keywords: Quantum Key Distribution $\cdot$ Network Security $\cdot$ Key Management $\cdot$ Survey

1 Introduction  
   1.1 Motivation  
   1.2 Comparison to Existing Surveys  
   1.3 Contribution  
   1.4 Paper Organization  

2 Key Management  
   2.1 Secure Key Storage  
   2.2 Key Synchronization  
   2.3 Global Key Distribution  
   2.4 Key Supply  

3 Key Management Solutions  

4 Discussion  
   4.1 Compatibility with Various Kinds of QKD Modules  
   4.2 Key Supply to the User Network  
   4.3 Secure Key Storage and Key Formatting  

5 Key Challenges and Future Directions  

6 Conclusion