The development of the communication technology era has made it easier in the process of exchanging information from various parties. However, not all of the information provided can be used by many parties. Sometimes the information is intended for partial purposes only or is confidential. So, it is necessary to process information security. Several ways can be used such as cryptography. This method is used to encrypt messages or information. Methods that can be used in cryptography include vigenere cipher and caesar cipher methods. Both of these methods use the technique of replacing each original character with a character or letter. Substitution is based on keywords or character position shift command. However, this method is quite easy to solve by using the Brute Force method and the frequency of letters that often appear. Based on this problem, it is necessary to modify or combine it so that it is more difficult to crack. This research describes the combination of the vigenere cipher and the caesar cipher methods. The two methods were then converted to the names of the chemical elements in the periodic table. Furthermore, the steganography process is carried out as a place to insert messages or information. From this process, it is expected that the encryption results will be more difficult to crack
Internet of Think (IoT) muncul sebagai isu besar di Internet, diiharapkan bahwa miliaran hal fisik atau benda akan dilengkapi dengan berbagai jenis sensor terhubung ke internet melalui jaringan serta dukungan teknologi seperti tertanam sensor dan aktualisasi. Penelitian ini bertujuan merancang serta analisis penerapan prototype Sistem Pengunci Pintu Melalui Internet Menggunakan Arduino Uno Berbasis Android. Penelian ini menggunakan metode SDLC dalam melakukan perancangan dan pengembangan prorotype sistem Pengunci Pintu Melalui Internet Menggunakan Arduino Uno Berbasis Android. Terdapat 3 tahapan dari metode SDLC yang digunakan dalam penelitian ini yaitu Analisis Kebutuhan, Desain Sistem dan Implementasi sistem. Inputan dari sistem ini berupa perintah on dan off dari smartphone yang dikirim ke thingspeak sebagai layanan server dan akan dilanjutkan ke perangkat arduino yang telah tersambung selenoid doorlock. Jika pintu dibuka, maka sensor magnetik switch akan mengirim kembali informasi ke thingspeak dan dilanjutkan ke smartphone sebagai feedback. Hasil penerapan bahwa sistem dapat melakukan lock dan unlock pintu jika perangkat sistem terhubung ke internet yang terhubung dengan layanan dari Thingspeak. prototype sistem pengunci pintu ini diimplementasikan pada 2 pintu yang telah terpasang Selemoid doorlock dan sensor magnetic switch. Hasil dari pengujian yang telah dilakukan di jalan mamo 2 pada tanggal 25-08-2016 rata-rata waktu diperlukan untuk lock = 4.36 detik dan unlock = 5.30 detik, sedangkan pengujian sensor rata-rata waktu yang diperlukan untuk mengirim data sensor dengan kondisi Terbuka = 12.33 detik dan Tertutup = 12.43 detik. Waktu delay tergantung pada kondisi jaringan yang terhubung dengan sistem.
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