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All Journal International Journal of Electrical and Computer Engineering Proceedings of KNASTIK Bulletin of Electrical Engineering and Informatics Jurnal Ilmiah Teknik Elektro Komputer dan Informatika (JITEKI) Indonesian Journal on Computing (Indo-JC) JIKO (Jurnal Informatika dan Komputer) Limits: Journal of Mathematics and Its Applications MATRIK : Jurnal Manajemen, Teknik Informatika, dan Rekayasa Komputer J-SAKTI (Jurnal Sains Komputer dan Informatika) Komputasi: Jurnal Ilmiah Ilmu Komputer dan Matematika JIPI (Jurnal Ilmiah Penelitian dan Pembelajaran Informatika) Jurnal JTIK (Jurnal Teknologi Informasi dan Komunikasi) JOURNAL OF INFORMATION SYSTEM RESEARCH (JOSH) Aiti: Jurnal Teknologi Informasi Idealis : Indonesia Journal Information System J-SAKTI (Jurnal Sains Komputer dan Informatika) Jurnal Nasional Teknik Elektro dan Teknologi Informasi International Journal on Advanced Technology, Engineering, and Information System (IJATEIS) Innovative: Journal Of Social Science Research Kesatria : Jurnal Penerapan Sistem Informasi (Komputer dan Manajemen) The Indonesian Journal of Computer Science Limits: Journal of Mathematics and Its Applications

Alz Danny Wowor

Universitas Kristen Satya Wacana

Author-ID : 2465986

Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Mathematics Public Health Other

Published : 32 Documents Claim Missing Document

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Penerapan Metode Simple Additive Weighting Pada Penentuan Tingkat Kesejahteraan Penduduk Provinsi Nusa Tenggara Timur Kaho, Monica Louisa Ratu; Tanaamah, Andeka Rocky; Wowor, Alz Danny
Proceedings of KNASTIK 2013
Publisher : Duta Wacana Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar

The importance of a system not only helping the work done quickly and easy but also could result accurate information. Recently many government's program especially related with society walfare those are not touch the right target because the inaccurate information about society welfare. Answering this problem, we need a system that resulting the accurate information about people welfare. To determine the level of people walfare use many criteria and alternative, to easing the determination of welfare level we need to applying Simple Additive Weighting method on the system because Simple Additive Weighting is one of completion method that involve many criteria and alternative. Through the information that result by the system that is level of people welfare in each regency of East Nusa Tenggara, hopefully could help the authority to determine which region to be priority for the implementation of the welfare developing program.

Domain Examination of Chaos Logistics Function As A Key Generator in Cryptography Alz Danny Wowor; Vania Beatrice Liwandouw
International Journal of Electrical and Computer Engineering (IJECE) Vol 8, No 6: December 2018
Publisher : Institute of Advanced Engineering and Science

The use of logistics functions as a random number generator in a cryptography algorithm is capable of accommodating the diffusion properties of the Shannon principle. The problem that occurs is initialization x was static and was not affected by changes in the key, so that the algorithm will generate a random number that is always the same. This study design three schemes that can providing the ﬂexibility of the input keys in conducting the examination of the value of the domain logistics function. The results of each schemes do not show a pattern that is directly proportional or inverse with the value of x0 and relative error x and successfully fulﬁll the properties of the butterﬂy effect. Thus, the existence of logistics functions in generating chaos numbers can be accommodated based on key inputs. In addition, the resulting random numbers are distributed evenly over the chaos range, thus reinforcing the algorithm when used as a key in cryptography.

Square transposition: an approach to the transposition process in block cipher Magdalena A. Ineke Pekereng; Alz Danny Wowor
Bulletin of Electrical Engineering and Informatics Vol 10, No 6: December 2021
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v10i6.3129

The transposition process is needed in cryptography to create a diffusion effect on data encryption standard (DES) and advanced encryption standard (AES) algorithms as standard information security algorithms by the National Institute of Standards and Technology. The problem with DES and AES algorithms is that their transposition index values form patterns and do not form random values. This condition will certainly make it easier for a cryptanalyst to look for a relationship between ciphertexts because some processes are predictable. This research designs a transposition algorithm called square transposition. Each process uses square 8 × 8 as a place to insert and retrieve 64-bits. The determination of the pairing of the input scheme and the retrieval scheme that have unequal flow is an important factor in producing a good transposition. The square transposition can generate random and non-pattern indices so that transposition can be done better than DES and AES.

The Implementation of f(x) = 3(x 3 − x 2 − x) + 2 as CSPRNG Chaos-Based Random Number Generator Maria Rosalina Yopeng; Alz Danny Wowor
Indonesia Journal on Computing (Indo-JC) Vol. 6 No. 1 (2021): April, 2021
Publisher : School of Computing, Telkom University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34818/INDOJC.2021.6.1.546

This research implemented the cubic function f(x) = 3(x^3 − x^2 − x) + 2 using a FixedPoint Iteration to produce several iteration functions that can be used as random number generator. The test results obtain six iteration functions, and based on graphic visualizationwith Scatter plot and randomness test with mono bit test, bit block, and run test, the results only obtain two iteration functions namely x2 − 1 + 2/(3x) and f(x) = 1 + 1/x − 2/(3x^2)which can produce CSPRNG Chaos-based random number. Encryption testing shows that both functions can generate keys that make plaintext and ciphertext statistically unrelated, so the f(x) = 1 + 1/x − 2/(3x^2) function can be used as a CSPNRG chaos-based random number generator function.

Regenerasi Fungsi Polinomial Dalam Rancangan Algoritma Berbasis CSPNRG Chaos Sebagai Pembangkit Kunci Pada Kriptografi Block Cipher Alz Danny Wowor
Limits: Journal of Mathematics and Its Applications Vol 14, No 1 (2017)
Publisher : Institut Teknologi Sepuluh Nopember

Penelitian ini mencari model baru dari fungsi polinomial yang dapat digunakan sebagai pembangkit bilangan acak berbasis CSPNRG chaos, kemudian dijadikan sebagai kunci pada kriptografi block cipher. Proses dilakukan dengan meregenerasi polinomial menggunakan fixed point iteration menjadi fungsi iteratif, dan pengambilan integer pada mantissa untuk memperoleh bilangan acak dari setiap iterasi. Setiap fungsi polinomial derajat-1, derajat-2, dan derajat-3 dapat digunakan sebagai fungsi pembangkit, tetapi diperlukan pemilihan koefisien dan konstanta yang tepat dan juga ketangkasan dalam proses manipulasi aljabar pada fixed point iteration. Secara spesifik, algoritma yang dirancang merupakan proses yang ampuh karena dapat menghasilkan bilangan acak walaupun secara fungsi iterasi tidak dapat menghasilkan bilangan acak. Pengujian korelasi pada block cipher menggunakan kunci dari bilangan acak berada pada kategori ‘rendah’, sehingga secara kriptografi kunci tersebut dapat membuat plainteks dan cipherteks tidak berhubungan secara statistik, kondisi ini akan mempersulit kriptanalis untuk melakukan kriptanalisis. Fungsi polinomial yang menjadi pembangkit dan menghasilkan bilangan acak dapat menjadi embrio dalam membangun konsep unbreakble cipher.

Regenerasi Fungsi x2-9x-99 Dalam Pembangkit Bilangan Acak Berbasis CSRPNG Chaos David Lihananto; Alz Danny Wowor
AITI Vol 16 No 2 (2019)
Publisher : Fakultas Teknologi Informasi Universitas Kristen Satya Wacana

Penelitian ini menguji apakah fungsi f(x)=x2-9x-99 dapat digunakan sebagai pembangkit kunci dalam kriptografi. Fungsi kuadrat diregenerasi menggunakan metode iterasi titik tetap menjadi fungsi iterasi. Dilakukan pembagian digit angka untuk hasil keluaran fungsi iterasi untuk menghasilkan bilangan chaos. Pengujian pengacakan menggunakan pengujian run test dan monobit. Dilanjutan dengan pengujian kriptografi untuk dapatkan hasil korelasi antara chiperteks dan kunci yang akan dijadikan sebagai keputusan apakah kunci yang dihasilkan sudah acak atau tidak. Berdasarkan penelitian yang telah dilakukan fungsi iterasi xi = (xi-12-9xi-1-99)/9 dapat menghasilkan bilangan acak CSRPNG Chaos dengan tingkat korelasi yang paling mendekati nilai 0.

Desain S-Box Fleksibel: Regenerasi Konstanta dan Koefisien Fungsi Linier Berbasis CSPRNG Chaos Bambang Susanto; Alz Danny Wowor; Vania Beatrice Liwandouw
Jurnal Nasional Teknik Elektro dan Teknologi Informasi Vol 8 No 1: Februari 2019
Publisher : Departemen Teknik Elektro dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1281.002 KB)

The substitution process in block ciphers usually uses static s-boxes, where the value of each s-box entry is always fixed and the functions are one-to-one. Visually, the dataset pattern in the input is also seen in the output. This will make it easier for cryptanalysts to look at patterns and can predict behavior based on the input. This study designs a flexible s-box where each entry contains a linear function, with constants and coefficients generated by CSPRNG chaos from the key input. The strength of a flexible s-box can be seen when changing key inputs (although 1 bit different) will produce different s-boxes. In addition, the same input dataset values will produce different outputs, so flexible s-boxes are one-to-many. Statistical tests show that the average correlation is in a low category. Tests on the cipher block also fulfill the Shannon Principle. The principle of Iterated Cipher with n-round is filled with n > 5 and 46n random numbers. The Avalanche Effect test on the algorithm gives better results than Two fish even though it is still below the DES.

DESAIN PEMBANGKIT KUNCI BLOCK CIPHER BERBASIS CSPRNG CHAOS MENGGUNAKAN FUNGSI TRIGONOMETRI Kuniarti Paraditasari; Alz Danny Wowor
JIPI (Jurnal Ilmiah Penelitian dan Pembelajaran Informatika) Vol 6, No 2 (2021)
Publisher : STKIP PGRI Tulungagung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29100/jipi.v6i2.2115

Penelitian ini meregenerasi fungsi trigonometri dan dijadikan sebagai pembangkit bilangan acak berbasis CSPNRG chaos . Setiap fungsi trigonometri dapat digunakan sebagai fungsi pembangkit, walaupun untuk cos x dan csc x memerlukan sedikit modifikasi. Pengujian enkripsi menunjukkan setiap kunci yang dihasilkan dari setiap fungsi pembangkit, dapat membuat plainteks dan cipherteks tidak berhubungan secara statistik. Kondisi ini akan mempersulit kriptanalis untuk melakukan serangan pada algoritma. Secara spesifik, rancangan merupakan proses yang baik, karena dapat menghasilkan bilangan acak berbasis CSPRNG chaos . Sehingga fungsi trigonometri dapat digunakan sebagai pembangkit dalam menghasilkan kunci pada kriptografisandi blok .

Desain Pembangkit Kunci LFSR dengan Skema A5/1 Menggunakan empat Blok Bit Fungsi XOR Teguh Septianto Nahading; Alz Danny Wowor
Kesatria : Jurnal Penerapan Sistem Informasi (Komputer dan Manajemen) Vol 4, No 2 (2023): Edisi April
Publisher : LPPM STIKOM Tunas Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30645/kesatria.v4i2.177

This research designs the Random Number Generator by using the LFSR with an A5/1 scheme and also four feedback for the Random Number Generator. Every feedback functions use the XOR operation to determine the new bit value in the next literation. Random results of the Run Test, Mono Bit, and Block bit shows that the algorithm is consistently able to generate random output even with various input variant. Comparison examination using previous research algorithms shows that four selected feedback functions generate random numbers. The encryption test shows that plaintext and ciphertext have “very low” and “low” correlation rates where the average correlation for every plaintext test is close to 0. The LFSR key generator with an A5/1 algorithm scheme using four XOR functions can generate very good random output for use in Stream Cipher.

ANALISIS SENTIMEN MASYARAKAT TERHADAP PROGRAM BADAN PENYELENGGARA JAMINAN SOSIAL (BPJS) MENGGUNAKAN DATA TWITTER Ardika, Zefanya; Wowor, Alz Danny
JIPI (Jurnal Ilmiah Penelitian dan Pembelajaran Informatika) Vol 9, No 1 (2024)
Publisher : STKIP PGRI Tulungagung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29100/jipi.v9i1.4272

Jaminan Kesehatan Nasional merupakan salah satu program kesehatan pemerintah. Program ini menggunakan sistem premi, mirip dengan asuransi kesehatan pada umumnya, dimana untuk memastikan bahwa setiap orang dapat mengakses pelayanan kesehatan yang merata dan adil. Program ini adalah salah satu cara kebijakan ini dipraktikkan dengan mendirikan Badan. Dengan Badan hukum yakni Badan Penyelenggara Jaminan Sosial (BPJS) yang terbentuk untuk menyelenggarakan program jaminan kesehatan. Riset ini dibuat untuk melihat sentimen yang diberikan oleh masyarakat terkait program BPJS, riset dilakukan dengan Analisa Sentimen menggunakan metode atau model Naive Bayes, SVM, dan Random Forest. Data yang digunakan dalam riset ini merupakan Data tweet dari pengguna twitter yang diambil pada April 2023 dengan menggunakan API Twitter, mengambil 6000 unggahan tweet pengguna. Riset ini menggunakan model Naıve Bayes, SVM, dan Random Forest yang masing masing memberikan hasil yang cukup akurat dengan tingkat akurasi sebesar 99.3%, 99.6%, dan 99.2%. Dari 1053 data bersih setelah preprocessing, menghasilkan metode terbaik diantara metode lain dengan metode SVM menghasilkan 424 tweet positif. 357 tweet netral, dan 268 tweet negatif.

Co-Authors A.A. Ketut Agung Cahyawan W Andeka Rocky Tanaamah Aneria, Gianina Dea Ardika, Zefanya Aryatama, Andrew Ananta Bakar, Theis Huyo Rooney Bambang Susanto Canavaro, Claudio David Lihananto Dimara, Indri Erwien Christianto Febriyanti, Monica Dias Felix David Jesajas, Marthen Billy Juanito, Yunias Kaho, Monica Louisa Ratu Kuniarti Paraditasari Kuniarti Paraditasari Liwandouw, Vania Beatrice Magdalena A. Ineke Pekereng Magdalena Ariance Ineke Pakereng Maria Rosalina Yopeng Nathanael, Hizkia Pallangan, Jorghie Theodore Pallangan, Jorghie Theodore Kenzo Putra, Gidion Albeth Anoraga Putri, Febyola Kurnia Tiara Ramadhani, Ahmad Sakalaty, Alfa Krisnanugrah Salama, Aditya Simanjuntak, Yohanes Albryan Susanto, Vincent Exelcio Susilo Wibowo, Ayub Teguh Septianto Nahading Vania Beatrice Liwandouw Vania Beatrice Liwandouw Wibowo, Alvin Cahyo Widiana, Kadek Yopeng, Maria Rosalina Yos Richard Beeh

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