In this paper, concepts for adapting the IPFIX protocol to the needs of wireless sensor networks have been investigated, resulting in the development of the protocol TinyIPFIX, which is an adaptation of the IP Flow Information Export (IPFIX) protocol. The new protocol has been assessed in a representative use case involving a building application. TinyIPFIX has been extended by compression capabilities and by aggregation functionality. Furthermore, extensions to support secure data transmission have been developed, using the protocol Datagram Transport Layer Security (DTLS). This solution ensures that data collected by sensor nodes is transmitted via secure channels to a global data sink, and that authorized access is ensured from a data sink to a wireless sensor network.