Configuring Wire Encryption
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Enable RPC Encryption

How to enabke RPC Encryption.

The most common way for a client to interact with a Hadoop cluster is through RPC. A client connects to a NameNode over RPC protocol to read or write a file. RPC connections in Hadoop use the Java Simple Authentication and Security Layer (SASL) which supports encryption. When the property is set to privacy, the data over RPC is encrypted with symmetric keys.
Enable Encrypted RPC by setting the following properties in core-site.xml:
(Also supported are the ‘authentication’ and ‘integrity’ settings.)