NETWORKS AND THEIR IMPLICATIONS FOR SECURITY PRACTITIONERS – p4 HOW ISLAMIC STATE USES TELEGRAM TO COMMUNICATE – p14 PREDICTING THE IMPACT OF BAD APPLES ON TEAM PERFORMANCE – p8 CREST SECURITY REVIEW SUMMER 2017 / ISSUE 05 Networks ISSN 2398-0540 (PRINT) ISSN 2398-0559 (ONLINE)