SOA Security Using VPN's
Service Oriented Architecture (SOA) has been around for a few years now and has presented security challenges to users. Usually based on Web Services, SOA comes in a variety of configurations and platforms. And yet, critical applications are sometimes run using SOA.
One useful approach to securing SOA is to make use of simple VPNs. VPNs can be used to route service requests and thereby provide authentication and encryption techniques to protect the transmissions. They can be an important element of SOA security. For more on this approach, see this article on the CIO site.