In　the　paradigms　of　the　Internet　of　Things　(IoT)　as　well　as　the　evolving　Web　of　Things　(WoT)　and　the　emerging　Wisdom　Web　of　Things　(W2T),　not　only　can　the　data　collected　by　the　sensor　nodes　(i.e.,　the　things)　in　the　wireless　sensor　networks　(WSNs)　be　transmitted　to　and　processed　at　Internet　nodes　and　subsequently　transformed　into　information,　knowledge,　wisdom　and　eventually　into　services　to　serve　humans,　but　human　users　can　also　access,　control　and　manage　the　sensor　nodes　in　the　WSNs　through　nodes　in　the　Internet.　Since　data　are　the　basis　for　enabling　applications　and　services　in　W2T,　it　becomes　imperative　that　enabling　technologies　for　end-to-end　security　be　developed　to　secure　data　communication　between　Internet　user　nodes　and　sensor　server　nodes　to　protect　the　exchange　of　data.　However,　traditional　security　protocols　developed　for　the　Internet　rely　mostly　on　symmetric　authentication　and　key　management　based　on　public　key　algorithms,　thus　are　deemed　to　be　unsuitable　for　WSNs　due　to　resource　constraints　in　the　sensor　nodes.　Specifically,　acting　as　the　server　nodes　in　this　scenario,　sensor　nodes　cannot　take　on　the　heavy　duty　like　regular　servers　in　the　Internet.　Meanwhile,　current　security　mechanisms　developed　for　WSNs　have　mainly　focused　on　the　establishment　of　keys　between　neighboring　nodes　at　the　link　layer　and　thus　are　not　considered　to　be　effective　for　end-to-end　security　in　the　W2T　scenario.　In　this　paper,　we　propose　an　end-to-end　secure　communication　scheme　for　W2T　in　WSNs　in　which　we　follow　an　asymmetric　approach　for　authentication　and　key　management　using　signcryption　and　symmetric　key　encryption.　In　our　proposed　scheme,　a　great　part　of　the　work　for　authentication　and　access　control　is　shifted　to　a　gateway　between　a　WSN　and　the　Internet　to　reduce　the　burden　and　energy　consumption　in　the　sensor　nodes.　In　addition,　our　scheme　can　ensure　the　privacy　of　user　identities　and　key　negotiation　materials,　and　denial　of　service　(DoS)　attacks　targeted　at　the　sensor　nodes　can　be　effectively　blocked　at　the　gateway.　We　will　also　conduct　quantitative　analysis　and　an　experiment　to　show　that　our　proposed　scheme　can　enhance　the　effectiveness　of　end-to-end　security　while　reducing　the　cost　of　sensor　nodes　in　terms　of　computation,　communication　and　storage　overhead　as　well　as　the　latency　of　handshaking　compared　to　similar　schemes　that　are　based　on　Secure　Sockets　Layer　(SSL)　and　Transport　Layer　Security　(TLS)　protocols.