 Key management Secure Sockets Layer (SSL) provides an essential building block for all secure
communications, and all Azure services support SSL-based communication. Azure Key Vault can
help improve overall network-based communication security by centralizing sensitive certificates,
keys, and secrets in a secure, audited hardware- or software-based central service and by removing the need for apps to maintain these values directly. With this centralization, organizations can regularly change keys globally without having to redeploy apps or services, in addition to providing a more granular level of control over the keys themselves.

 VPN and Wi-Fi access Microsoft Intune can provide additional peace of mind by enforcing mobile device resource access control policies. Using Intune, you can require VPN or secure Wi-Fi access to connect to key services, helping you to manage device profiles.

Source Of Information : Microsoft Platform and Tools for Mobile App Development