TLS (Transport Layer Security) protocols provide privacy and data integrity for establishing secured connections between applications. Over the period of time TLS has evolved and new versions have continued to fix vulnerabilities in older versions and also add newer capabilities.
Having spent many years in the Public Sector space, I have made a lot of friends on both the contractor and government employee sides of the aisle. So we are always having conversations about how Azure is making the world better both commercially as well as in the Public Sector space.
One of the capabilities in the Web Apps Service is placing your Azure resources in a non-internet routable network that you can control access to. These networks can be connected to your on-premise networks using VPN technologies.