In　the　modern　digital　era,　everyone　is　partially　or　fully　integrated　with　cloud　computing　to　access　numerous　cloud　models,　services,　and　applications.　Multi-cloud　is　a　blend　of　a　well-known　cloud　model　under　a　single　umbrella　to　accomplish　all　the　distinct　nature　and　realm　requirements　under　one　service　level　agreement　(SLA).　In　current　era　of　cloud　paradigm　as　the　flood　of　services,　applications,　and　data　access　rise　over　the　Internet,　the　lack　of　confidentiality　of　the　end　user＇s　credentials　is　rising　to　an　alarming　level.　Users　typically　need　to　authenticate　multiple　times　to　get　authority　and　access　the　desired　services　or　applications.　In　this　research,　we　have　proposed　a　completely　secure　scheme　to　mitigate　multiple　authentications　usually　required　from　a　particular　user.　In　the　proposed　model,　a　federated　trust　is　created　between　two　different　domains:　consumer　and　provider.　All　traffic　coming　towards　the　service　provider　is　further　divided　into　three　phases　based　on　the　concerned　user＇s　data　risks.　Single　sign-on　(SSO)　and　multifactor　authentication　(MFA)　are　deployed　to　get　authentication,　authorization,　accountability,　and　availability　(AAAA)　to　ensure　the　security　and　confidentiality　of　the　end　user＇s　credentials.　The　proposed　solution　exploits　the　finding　that　MFA　achieves　a　better　AAAA　pattern　as　compared　to　SSO.