Data security in Amazon ElastiCache
To help keep your data secure, Amazon ElastiCache and Amazon EC2 provide mechanisms to guard against unauthorized access of your data on the server.
Amazon ElastiCache (Memcached) also provides encryption features for data on caches running Memcached versions 1.6.12 or later.
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In-transit encryption encrypts your data whenever it is moving from one place to another, such as between nodes in your cluster or between your cache and your application.
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At-rest encryption encrypts your on-disk data during sync and backup operations.