In March 2023, AWS rolled out support for version 1.3 of the Transport Layer Security (TLS) protocol in Application Load Balancers. TLS 1.3 is optimized for performance and security by using one round trip (1-RTT) TLS handshakes, and only supporting ciphers that provide perfect forward secrecy.
Healthcare Blocks-managed Application Load Balancers now utilize TLS 1.3 by default when supported by clients and accept TLS 1.2 for backwards-compatibility.