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<p class="Abstrak">Pada penelitian sebelumnya telah dikembangkan sebuah <em>middleware</em> dengan pendekatan <em>event-driven</em> yang mampu mendukung interoperabilitas berbagai macam perangkat sensor pada lingkungan IoT. Namun, skema komunikasi pada <em>middleware</em> tersebut masih terdapat celah keamanan dan menimbulkan ancaman berupa <em>eavasdropping</em>. Solusi dari permasalahan ini adalah menerapakan mekanisme <em>end-to-end security</em>. Dalam penelitian ini dilakukan penerapan algoritme kriptografi AES-CBC 128 pada komunikasi node sensor ke <em>middleware</em> dan mekanisme TLS pada komunikasi <em>middleware</em> dengan aplikasi berbasis IoT. Hasil yang didapat <em>end-to-end security</em> berbasis kriptografi pada pub/sub dapat menjamin kerahasiaan data dengan enkripsi payload akan tetapi topik masih terlihat, sedangkan TLS/SSL menjamin kerahasiaan seluruh data yang dikirim. Penggunaan mekanisme ini tidak berdampak signifikan pada <em>delay</em> pengiriman data, yaitu masih dibawah 1 detik</p><p class="Abstrak"> <em><strong>Abstract</strong></em></p><p class="Abstrak"><em>An IoT middleware for handling interoperability is proposed in previous works. However, a vulnerability that can lead to the eavesdropping attack exist. there is no security mechanism in the communication system among middleware with other parties like node sensors and subscribers. This research implements the end to end security to the existing IoT middleware.  AES-CBC 128 is used to secure communication between sensor nodes to middleware and used TLS/SLL between middleware and subscriber. The results show both mechanisms can securely communication between middleware and other parties, but AES-CBS can only secure data payload, not entire data. This mechanism has no significant impact on the delay transmission, which is still under 1 second</em></p>

An Internet of Things (IoT) middleware can solve interoperability problem among "things" in IoT infrastructure by collecting data. However, the sensor nodes' data that is collected by the middleware cannot be directly delivered to cloud applications since the sensor nodes and the middleware are located in intranet. A solution to this problem is an Internet Gateway Device (IGD) that retrieves data from the middleware in intranet then forwards them to cloud applications in the internet. In this study, an IGD based on cellular network is proposed to provide wide-coverage internet connectivity. Two test scenarios were conducted to measure delay and throughput between the IGD and the cloud application; using data from DHT22 sensor and image sensor respectively. The results of the first test scenario using DHT22 sensor show that the average delay is under 5 seconds and the maximum throughput is 120 bps, while the second one using image sensor concludes that the average delay is 595 seconds and the maximum throughput is 909 bps.

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