Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/2320#issuecomment-55641646
I was responding to your comment about needing Diffie Hellman. We already
use an authentication approach based on HD.
Encryption is an orthogonal issue. In general though Spark only provides
authentication and not encryption. We assume that someone can't sniff the
network randomly. That's the model we have right now in the rest of Spark for
YARN etc.
We do protect against someone connecting to well known ports and trying to
e.g. ask for credential data. That's what we are trying to protect here.
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