Cloud　Computing　(CC)　is　a　paradigm　of　providing　services　to　a　variety　of　clients,　individuals,　and　organizations,　through　a　large-scale　distributed　computing　environment.　It　is　a　shared　pool　of　resources　that　are　dynamically　configured　to　meet　demands　and　provide　reliable　and　rapid　services,　with　minimal　management　required　from　the　clients.　The　number　of　enterprises　and　individuals　using　both　public　and　private　CC　services　is　steadily　increasing,　yet　there　is　a　deep　concern　about　the　security　risks　of　embedding　their　assets　in　cloud.　Research　on　CC　security　has　only　revealed　the　necessity　to　improve　security,　with　no　consensus　yet　on　a　sound　methodology　at　CC　level　for　achieving　a　satisfactory　level　of　trust　of　CC　clients.　This　paper　contributes　to　this　area　of　research　by　offering　two　proposals.　The　first　proposal　is　a　uniform　CC　service　model　to　earn　trust　of　clients.　The　second　proposal　is　the　application　of　Context-sensitive　Role-Based　Access　Control　(CRBAC)　method　for　establishing　identity,　and　enforcing　security　and　privacy　in　CC　service　transactions.　©　2018　IEEE.