As　an　important　step　in　the　IoT　workflow,　IoT　data　aggregation　transmits,　filters,　analyzes　and　synthesizes　data　collected　by　IoT　devices　such　as　sensors　to　help　people　make　decisions　and　evaluate.　However,　the　traditional　IoT　data　aggregation　model　relies　on　a　central　data　aggregator,　such　as　a　third-party　cloud　server,　and　uses　traditional　encryption　technology　to　process　data,　which　may　face　problems　such　as　original　data　leakage　and　calculation　errors,　and　it　is　difficult　to　ensure　that　data　participants　can　safely　participate　in　the　aggregation.　Due　to　its　homomorphic　characteristics　and　performance　improvements　in　recent　years,　homomorphic　encryption　technology　makes　it　possible　to　use　homomorphic　encryption　technology　to　protect　data　privacy　during　data　transmission　and　calculation.　In　addition,　as　a　non-tamperable　ledger　technology,　the　blockchain　can　be　used　to　store　evidence,　specifically　to　store　the　promises　made　by　the　commitment　mechanism,　and　complete　the　verification　of　data　consistency　and　correctness.　©　2023　SPIE.