hi，
Kafka 0.9 had announced to support client authentication and data
encryption by SSL. After read the document of kafka security, it seems that if
we want to use client authentication by SSL, data encryption must be used
together, But using data encryption, performance will be affected.
So I want to known can we only enable client authentication and disable
data encryption, if it can, how to do it? thanks!-- Best regards! Joey Zhang
