Practicallyeverynetwork-connectedmobileappusestheHypertextTransferProtocol(HTTP)orHTTPoverTransportLayerSecurity(TLS),HTTPS,tosendandreceivedatatoandfromremoteendpoints.Consequently,network-basedattacks(suchaspacketsniffingandman-in-the-middle-attacks)areaproblem.Inthischapterwediscusspotentialvulnerabilities,testingtechniques,andbestpracticesconcerningthenetworkcommunicationbetweenmobileappsandtheirendpoints.