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Perancangan Aplikasi Kriptografi Menggunakan Algoritma RC4 (Rivest Code 4) Untuk Mengamankan Pesan Email di PT CREATIFACTORY Rifki Darmawan; Sewaka
OKTAL : Jurnal Ilmu Komputer dan Sains Vol 2 No 03 (2023): OKTAL : Jurnal Ilmu Komputer Dan Sains
Publisher : CV. Multi Kreasi Media

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Abstract

The development of information technology that is so advanced rapidly has made information a basic need for everyone who has it. To be able to secure the information we have, one of the techniques for securing data and information is to use cryptography. Therefore, the author makes an application that can maintain the confidentiality of information from data theft crimes, and the application in question is a web-based email cryptography application. This application can be used to secure the data contained in the user's email. In this application the cryptographic algorithm that will be used is the Rivest Code 4 (RC4) algorithm. RC4 is a stream cipher type algorithm that processes input data units. The Rivest Code 4 (RC4) algorithm is also part of a symmetric algorithm, where the encryption and decryption processes have the same key. Making this application using the PHP programming language. The modeling method in making this application is the UML (Unified Modeling Language) method. The result of this research is an email security cryptography application that is able to encrypt and decrypt documents in formats such as *ai, *ps, *indd, *docs, *xls, *pdf, *ppt, *svg etc, using the Rivest Code 4 (RC 4) algorithm web based.
Prototype SmartHome Lampu dan Kipas Otomatis Menggunakan Sensor Cahaya LDR dan Suhu Berbasis NodeMCU Esp8266 dengan Kendali Telegram Sewaka; Maehcel Rahman
OKTAL : Jurnal Ilmu Komputer dan Sains Vol 5 No 08 (2026): OKTAL : Jurnal Ilmu Komputer Dan Sains
Publisher : CV. Multi Kreasi Media

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Abstract

The widespread use of the Internet has given birth to a new concept called the Internet Of Things (IoT). This concept is based on expanding the use and benefits of the Internet by embedding a controller and sensors that can connect and share data continuously. Therefore, there is a prototype Smart Home system that can control automatic lights, and automatic fans with access control using the Telegram application. Using LDR and DHT22 sensors are sensors used in this tool with a microcontroller, namely NodeMCU ESP-8266. LED sensor detects a light intensity value of less than 600. The fan is the output result of the DHT22 sensor when the sensor detects a temperature of more than 33o Celsius. The data obtained from the sensor will be received and sent to the NodeMCU for later to be displayed on the telegram application as a form of monitoring and the user can control it through the telegram application.
Co-Authors Ade Supriono Ananda Novprico Syahdaya Anas Nasrullah Nasrull Ayuk Indah Sari Benny Suparman Deni Setiawan Imam Sholikhin Maehcel Rahman Muhammad Restu Al Kholiq Rifki Darmawan Rizki Kurniawan Sabdho Cathur Kuncoro