Information Security 17th International Conference, ISSA 2018, Pretoria, South Africa, August 15-16, 2018, Revised Selected Papers - Venter, Hein; Venter, Hein; Loock, Marianne; Loock, Marianne; Coetzee, Marijke; Coetzee, Marijke; Eloff, Mariki; Eloff, Mariki; Eloff, Jan; Eloff, Jan (Springer International Publishing : Imprint: Springer, 2019)