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https://issues.apache.org/jira/browse/KAFKA-3665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15276118#comment-15276118
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Rajini Sivaram commented on KAFKA-3665:
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[~ijuma] [~junrao] I dont believe HTTPS validates client hostname/IP address 
and Kafka definitely doesn't. For client requests that go through a VIP for the 
initial request, each broker's certificate would need SubjectAltNames with the 
VIP as well as its advertised host name.

> Default ssl.endpoint.identification.algorithm should be https
> -------------------------------------------------------------
>
>                 Key: KAFKA-3665
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3665
>             Project: Kafka
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 0.9.0.1
>            Reporter: Ismael Juma
>            Assignee: Ismael Juma
>             Fix For: 0.10.0.0
>
>
> The default `ssl.endpoint.identification.algorithm` is `null` which is not a 
> secure default (man in the middle attacks are possible).
> We should probably use `https` instead. A more conservative alternative would 
> be to update the documentation instead of changing the default.
> A paper on the topic (thanks to Ryan Pridgeon for the reference): 
> http://www.cs.utexas.edu/~shmat/shmat_ccs12.pdf



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