Potential vulnerabilities regarding MAVLink v2.0 message authentication

[qingxiang xu]

Dear MAVLink Development and Maintenance Team:
Hello!

First, I would like to thank you for your outstanding work on the MAVLink protocol. MAVLink has greatly advanced the industry with its lightweight, high efficiency, and excellent cross-platform compatibility. During a recent security review and in-depth investigation of MAVLink V2.0 message authentication, we appear to have discovered a potential security vulnerability. We would like to report this issue to you so that MAVLink can become more secure and robust. Please refer to the attached description and project code for detailed security information.
I believe that resolving this issue promptly will help further enhance the robustness and security of the MAVLink protocol.

Looking forward to your reply. 

Thank you!