As we'll see, the specific method we use to transmit documents largely depends on the required level of security. On the other hand, the choice of transport can restrict the security options. However, the choices are often made with security as the primary consideration. Here are the most common options for transport.
Another option may involve one or more of these transports. Some trading communities implement virtual private networks ( VPNs ) to establish secure sessions over the public Internet. In most such implementations connecting to the VPN usually requires an X.509 certificate. When VPN technology first started coming into vogue there was a great deal of interest in establishing these trading community “based VPNs. One example is the ANX network (originally the Automotive Network Exchange) at www.anx.com. However, after the initial surge of interest this type of VPN has generally not grown as fast as internal corporate VPNs. But don't be surprised if you are asked to join a VPN. Many VPN client software packages come with the required file transport and packaging features, so installing and using one shouldn't be overly difficult. Integrating it with your business applications may not be so easy.