... How are you sure you’re talking to the right person? To architect and deploy a VPN, we need to understand how to apply these three tools. These concepts are easy to grasp at the conceptual level, ... pieces of e-commerce together. It all comes down to trust and PKI provides the inter-trust relationship needed for people to communicate.3 - 18 VPNs, PKI, and PGP - SANS ©2001 18 What is PKI?• ... corresponds to the gateway you want to talk to. The flow here goes like this: information goes to the first gateway, which encodes the payload, puts a new header on, and sends it to the second...