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All Journal Jurnal TIMES d'Cartesian: Jurnal Matematika dan Aplikasi Jurnal Publikasi Sistem Informasi dan Manajemen Bisnis
Chriestie Montolalu
Unknown Affiliation
Computer Science & IT Decision Sciences, Operations Research & Management Mathematics

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IMPLEMENTASI KRIPTOGRAFI OUT BY SPIRALLY PADA PENGAMANAN FILE TEKS MENGGUNAKAN KUNCI POLYALPHABETIC Toar, Justicia Natania; Ketaren, Eliasta; Chriestie Montolalu
Jurnal TIMES Vol 14 No 2 (2025): Jurnal TIMES
Publisher : STMIK TIME

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Abstract

Perkembangan teknologi informasi yang semakin pesat membawa dampak positif dan kemudahan dalam hal penyimpanan dan pertukaran data informasi, namun dapat juga menimbulkan potensi risiko berupa pencurian, manipulasi, hingga perusakan data sehingga dibutuhkan mekanisme perlindungan data yang lebih kuat. Metode Out by Spirally digunakan sebagai teknik transposisi dengan menyusun karakter plaintext ke dalam matriks dan membacanya menggunakan pola spiral, sedangkan Polyalphabetic digunakan sebagai teknik substitusi dengan tiga kunci berbeda berdasarkan 90 karakter yang digunakan yaitu huruf kecil, huruf besar, angka dan simbol tanda baca. Sistem diuji menggunakan teks biasa serta format file teks, yaitu pdf, docx, dan txt, untuk melihat kemampuan enkripsi dan dekripsi. Hasil pengujian menunjukkan bahwa sistem mampu mengubah plaintext menjadi ciphertext dan mampu mengembalikannya ke teks asli menggunakan kunci yang sesuai. Penelitian ini menyimpulkan bahwa berhasil mengimplementasikan kriptografi out by spirally menggunakan kunci polyalphabetic untuk pengamanan file teks.
Perancangan Ui/Ux Aplikasi untuk Monitoring Pemberian Stimulasi Perkembangan Janin Berbasis Mobile Menggunakan Metode Double Diamond Jeremy Rayvlitan Patras; Chriestie Montolalu; Stephano Caesar Wenston Ngangi; Christian Alderi Jeffta Soewoeh; Mahardika Inra Takaendengan; Dodi Sutarma Lapihu
Jurnal Publikasi Sistem Informasi dan Manajemen Bisnis Vol. 5 No. 3 (2026): September : Jurnal Publikasi Sistem Informasi dan Manajemen Bisnis
Publisher : Pusat Riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jupsim.v5i3.7876

Abstract

Pregnant women need structured prenatal stimulation guidance to support fetal nervous system development. However, most existing pregnancy health applications only provide general information and lack personalized, scheduled, and activity-based prenatal stimulation guidance. This research is a Research and Development (R&D) study that aims to design a user interface and user experience (UI/UX) prototype of a mobile application called Stimy using the Double Diamond method, which consists of the Discover, Define, Develop, and Deliver phases. User requirements were collected through literature studies, interviews, observations, and questionnaires, then analyzed to produce wireframes, mockups, and a high-fidelity prototype using Figma. The prototype was evaluated through usability testing on the Maze platform using the System Usability Scale (SUS) questionnaire. The resulting prototype provides features including fetal development information, prenatal stimulation guidance, music recommendations, schedule reminders, activity tracking, and educational articles. Usability testing showed excellent results, with an effectiveness rate of 100%, an Overall Relative Efficiency (ORE) of 85.5%, a memorability rate of 100%, a MAUS score of 92, and a SUS score of 79.46, categorized as Good and Acceptable. These findings indicate that the Double Diamond method effectively supports the design of a usable UI/UX prototype that meets the needs of pregnant women and can serve as a foundation for future application development.
Co-Authors Altien Jonathan Rindengan Altien Rindengan Benny Pinontoan Charles Mongi Christian Alderi Jeffta Soewoeh Christian Elric Koba Dodi Sutarma Lapihu Eliasta Ketaren, Eliasta Jeremy Rayvlitan Patras Mahardika Inra Takaendengan Mans Lumiu Mananohas Rondo Morihito Safril Bahar Stephano Caesar Wenston Ngangi Toar, Justicia Natania Tri Buana Donda Yohanes Langi