Amazon ElastiCache for Redis adds support for customer managed keys in AWS Key Management Service for encryption at rest
Amazon ElastiCache for Redis now supports encryption at rest using customer managed customer master keys (CMKs) in AWS Key Management Service (KMS). You can now use your own CMKs to encrypt data at rest in ElastiCache for Redis. Customer managed CMKs are CMKs in your AWS account that you create, own and manage. When you enable encryption at rest with CMKs, Amazon ElastiCache for Redis encrypts all data on disk including service backups stored in Amazon S3 with your encryption key.