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All Journal Jurnal Teknik dan Informatika Proceeding International Seminar of Islamic Studies
Agung Purnomo Sidik
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Religion Arts Astronomy Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Electrical & Electronics Engineering Engineering Law, Crime, Criminology & Criminal Justice Mathematics Physics Transportation Other

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RANCANGAN MODEL ALGORITMA HYBRID TEKNIK ENKRIPSI XOR DENGAN KOMBINASI MODE BLOCK CIPHER CBC - ECB 512-BITS DAN ALGORITMA RSA Agung Purnomo Sidik
Jurnal Teknik dan Informatika Vol 6 No 2 (2019): JUTI
Publisher : UNIVERSITAS PEMBANGUNAN PANCA BUDI

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Abstract

Penelitian ini dilakukan dengan menganalisis kombinasi dari algoritma RSA mode operasi blok cipher ECB dan CBC dengan panjang blok 512-bits. Penelitian ini bertujuan untuk mendapatkan sebuah algoritma kripografi yang cepat, hemat sumber daya, dan terbebas dari masalah key distribution. Data yang digunakandalam pengujian merupakan data teks dengan panjang pesan dari 10 karakter hingga 1 juta karakter. Hasil penelitian menunjukkan bahwa kombinasi dari algoritma RSA dengan mode operasi CBC-ECB 512-bits mampu memberikan keamanan yang optimal terhadap data. Dimana cipher text dan cipher key yang dihasilkan akan sangat aman dari serangan exhaustive search atau bruto force. Dibutuhkan waktu hingga 1,80 x 10257 Tahun untuk memcahkan cipher text, sedangkan untuk cipher key nya dibutuhkan waktu 3,17 x10166 Tahun dengan teknik exhaustive search atau bruto force.
COMPARATIVE OF COMPANY PROFITABILITY BEFORE AND AFTER THE COVID-19 PANDEMIC IN RETAIL COMPANIES LISTED ON THE INDONESIA STOCK EXCHANGE Hartato Rianto; Agung Purnomo Sidik; Anita Putri
Proceeding International Seminar of Islamic Studies INSIS 3 (February 2022)
Publisher : Proceeding International Seminar of Islamic Studies

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This study was conducted to determine how financial performance in retail companies listed on the Indonesia Stock Exchange before and after the Covid-19 pandemic. The data used was secondary data obtained from the official website of the Indonesia Stock Exchange at www.IDX.co.id. The data used were in 2019 and 2020. The population in this research were 25 retail companies with 18 companies as the sample. The profitability ratios tested and compared were Gross Profit Margin (GPM), Operating Profit Margin (OPM), Net Profit Margin (NPM), Return on Assets (ROA), and Return on Equity (ROE). The method used was the Paired Sample T-Test with the help of the SPSS Version 24.0 application. The results showed that Gross Profit Margin (GPM), Operating Profit Margin (OPM), Net Profit Margin (NPM), Return on Assets (ROA), and Return on Equity (ROE) had no significant differences before and after the Covid pandemic. -19. The correlation results showed that only Gross Profit Margin (GPM) had a substantial relationship before and after the Covid-19 pandemic. In contrast, Operating Profit Margin (OPM), Net Profit Margin (NPM), Return on Assets (ROA), and Return on Equity (ROE) had no significant relationship before and after the Covid-19 pandemic.Keywords: Gross Profit Margin, Operating Profit Margin, Net Profit Margin, Return on AssetsReturn on Equity, Covid-19
Co-Authors Anita Putri Rianto, Hartato