Github user StephanEwen commented on a diff in the pull request:

    https://github.com/apache/flink/pull/2425#discussion_r86543731
  
    --- Diff: docs/internals/flink_security.md ---
    @@ -28,14 +28,16 @@ This document briefly describes how Flink security 
works in the context of vario
     and the connectors that participates in Flink Job execution stage. This 
documentation can be helpful for both administrators and developers 
    --- End diff --
    
    This document should probably start with an introduction to the different 
aspects of security:
    
      - Authentication (Flink authenticates at other services)
      - Authorization (No one unauthorized access the Flink cluster)
      - Encryption (no sniffing off data and credentials)
    
    Authorization alone is probably only meaningful to prevent "accidental 
mixups", all meaningfully secure setups would need Authorization and Encryption


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