To　become　an　indispensable　part　of　the　Internet　of　Things　(IoT),　wireless　sensor　networks　(WSNs)　have　to　be　integrated　into　the　Internet.　Under　such　circumstances,　any　IP-enabled　node　in　the　Internet　shall　be　able　to　directly　communicate　with　any　sensor　node　in　a　WSN.　Then,　multiple　sensor　nodes　can　be　used　to　monitor　an　event　and　jointly　generate　a　report　to　be　sent　to　one　or　more　Internet　nodes　for　monitoring　purposes.　Hence,　it　becomes　imperative　that　every　event　report　that　is　transmitted　from　within　the　WSN　be　authenticated　to　intended　Internet　users　and　efficiently　filtered　on　its　way　to　the　Internet　users.　However,　most　present　authentication　and　en-route　data　filtering　schemes　developed　for　WSNs　don＇t　consider　the　Internet　scenario　while　traditional　mechanisms　developed　for　the　Internet　can　hardly　be　suitable　due　to　resource　constraints　of　sensor　nodes　in　WSNs.　In　this　paper,　we　propose　an　authentication　and　en-route　data　filtering　scheme　for　WSNs　in　the　IoT　scenario　in　which　signature　shares　based　on　the　most　efficient　ID-based　signature　scheme　are　generated　and　distributed　by　making　use　of　verifiable　secret　sharing　cryptography.　Security　analysis　shows　that　the　proposed　scheme　can　defend　against　node　compromise　attacks　as　well　as　denial　of　service　(DoS)　attacks　that　cause　report　disruption　and　selective　forwarding　problems.　Energy　consumption　as　the　result　of　computation　and　communication　is　also　analyzed　to　show　the　advantages　of　our　scheme　compared　to　some　other　comparable　schemes.