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Hi Ishan,
You can enable authentication of your registered EC2 instances if you use HTTPS or SSL for your back-end connections. You can then use the authentication process to ensure that the instances accept only encrypted requests, and to ensure that each registered instance has the correct public key.
Learn more about Back-end Instance Authentication here:
https://docs.aws.amazon.com/elasticloadbalancing/latest/classic/elb-listener-config.html