“…Thus,determining wheredata resides andhowtoacquire datacanposemany challenges to DFEs.Forinstance,theDFanalysisofIoTdevicesusedinabusinessorhomeenvironmentcanbe challenginginrelationtoestablishingwhomdatabelongstosincedigitalartefactsmightbeshared ortransmittedacrossmultipledevices.Inaddition,duetothefactthatIoTdevicesutiliseproprietary formatsfordataandcommunicationprotocols,understandingthelinksbetweenartifactsinbothtime andspacecanbeverycomplex.AnotherchallengerelatedtotheDFIofIoTdevicesconcernsthe chainofcustody.Incivilorcriminaltrial,collectingevidenceinaforensicallysoundmannerand preservingchainofcustodyareofparamountimportance (Montasari,2017c;Montasarietal.,2019;Montasarietal.,2019;Montasari,2018;Montasari,2017a;Montasari,2016e OtherforensicchallengesposedbyIoTdevicesincludeissuessuchasavailability,authenticity and non-repudiation which are essential for forensically sound used of data (Lillis et al, 2016). PersistencyofdataisalsoanotherchallengeposedbyIoTdeviceswhichtendtohavelimitedmemory ornopersistentdatastorage.Consequently,anydatastoredforlongerperiodsislikelytobestored inin-networkhubsortobetransferredtothecloudformorepersistentstorage.Asaresult,problems associatedwithCloudForensics(asdiscussedinSub-Section2.1)willalsoberelevanttothefield ofIoT.Althoughoverthepastfewyears,theresearchcommunityhavebeenexaminingIoTdevices forthepurposesofforensics,theseworksarestillintheirinfancy.Therefore,inordertokeeppace withthenewIoTdevices,IoTForensicsrequiresamulti-facetedapproachinwhichevidencecan becollectedandanalysedfromavarietyofsourcessuchassensordevices,communicationdevices andcloudstorage,etc.…”