IAM Authentication is supported for Redis, but applies only to AWS API-level actions (e.g., creating, modifying, deleting clusters). It does not control client data access directly.
Redis
Redis AUTH: set a password/token when creating the cluster to enforce authentication for clients.
Works alongside security groups for network-level access control.
Supports SSL/TLS encryption in transit for secure client connections.
Memcached
Supports SASL-based authentication for client access (optional, advanced feature).