[Cassandra Wiki] Update of "InternodeEncryption" by DavidAllsopp

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The "InternodeEncryption" page has been changed by DavidAllsopp:
http://wiki.apache.org/cassandra/InternodeEncryption

New page:
Inter-node encryption uses standard TLS/SSL to authenticate and encrypt messages between nodes, to preotect data in transit between nodes, and to prevent unauthorized access to/control of nodes.

Encryption can be applied to all inter-node messages, or just messages crossing from one Datacenter to another.

This page needs fleshing out... skeleton instructions from https://issues.apache.org/jira/browse/CASSANDRA-3051 are:

 1. follow the steps for generating a keystore and a trust store here: http://download.oracle.com/javase/6/docs/technotes/guides/security/jsse/JSSERefGuide.html#CreateKeystore
 2. plug those files into encryption_options in cassandra.yaml
 3. make sure encryption_options.internode_encryption = all in the yaml.

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See also SimpleAuthenticator for details of the authentication of Thrift clients (rather than between nodes).