Software development comprises stages that are interrelated with one another. The analysis and design stages are the initial stages in software development. For novice software developers, diagram making as software modeling is something that can be done as an alternative in developing computer applications or systems. In this study, we carried the interface design for software modeling applications out. The application developed later is a web-based application as a solution to licensing problems and expensive software modeling tools. This study only focuses on application design, does not contain implementation and application testing. The method used in this research is a user-centered design method. This method was chosen because it uses the user as the center of the design. So we expect it that the design can adjust to the wants, needs, and needs of relevant users. After we have completed the design as a mockup, the next research is to implement and implement the applications that have been designed in this study based on the results of user feedback
Information technology is increasingly advanced and continues to develop rapidly with the times. Information technology covers almost all areas of life, including industry. CV. Aqualux Duspha Abadi is a water treatment & water purifier company based in Kudus, Central Java. This research was conducted to build an Inventory System application that aims to overcome several existing problems. The problems that occurred with the previous inventory system were monitoring the entry and exit of goods as well as the discrepancy between the number of goods and the data. This research uses the waterfall development method, this method has very sequential steps so that the development of a system will be more structured. In this study, researchers tested the functionality of the system using black-box testing, and to test the level of satisfaction of users, researchers used the user acceptance test (UAT). The result of this research is an android based inventory system application. Data from black-box testing is 100% valid and UAT test data shows a satisfaction rate above 90%.Keywords: Inventory System, Android, Waterfall, Black Box Testing, User Acceptance Test (UAT)
Penggunaan media online dalam melakukan aktivitas telah semakin marak terjadi pada dinamika masyarakat modern. Salah satu obyek sasaran dalam aktivitas online adalah citra digital. Citra digital ini dapat diperuntukan untuk kalangan terbatas saja sehingga mudah menjadi sasaran oleh peretas, terutama jika data citra digital tersebut bersifat penting. Disinilah kriptografi mengambil peran penting dalam mengamankan citra digital. Dengan menggunakan teknik Vernam Cipher, pesan citra digital dapat diacak dengan kunci yang berbeda untuk setiap karakter, sehingga pesan citra digital hanya dapat dibaca oleh penerima saja. Hasil enkripsi akan menghasilkan citra baru dengan adanya perubahan pada intensitas warna piksel. Dari 12 gambar dengan ukuran kurang dari 100 KB, tingkat keberhasilannya adalah 100%. Algoritma ini sangat cepat, dengan kecepatan enkripsi rata-rata 0,007785 dan dekripsi 0,006903 untuk gambar berformat JPEG dan memiliki ukuran piksel 384x384 Berdasarkan penelitian tersebut maka dapat disimpulkan bahwa Algoritma Vernam Cipher adalah algoritma yang baik dan cepat.
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