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All Journal InfoTekJar : Jurnal Nasional Informatika dan Teknologi Jaringan Jurnal Christian Humaniora
Grace Lamudur Arta Sihombing
Institut Agama Kristen Negeri Tarutung
Religion Humanities Computer Science & IT Education Social Sciences Other

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HYBRID CHRIPTOGRAPHY STREAM CIPHER AND RSA ALGORITHM WITH DIGITAL SIGNATURE AS A KEY Grace Lamudur Arta Sihombing
InfoTekJar : Jurnal Nasional Informatika dan Teknologi Jaringan Vol 1, No 2 (2017): InfoTekJar Maret
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/infotekjar.v1i2.66

Abstract

Confidentiality of data is very important in communication. Many cyber crimes that exploit security holes for entry and manipulation. To ensure the security and confidentiality of the data, required a certain technique to encrypt data or information called cryptography. It is one of the components that can not be ignored in building security. And this research aimed to analyze the hybrid cryptography with symmetric key by using a stream cipher algorithm and asymmetric key by using RSA (Rivest Shamir Adleman) algorithm. The advantages of hybrid cryptography is the speed in processing data using a symmetric algorithm and easy transfer of key using asymmetric algorithm. This can increase the speed of transaction processing data. Stream Cipher Algorithm using the image digital signature as a keys, that will be secured by the RSA algorithm. So, the key for encryption and decryption are different. Blum Blum Shub methods used to generate keys for the value p, q on the RSA algorithm. It will be very difficult for a cryptanalyst to break the key. Analysis of hybrid cryptography stream cipher and RSA algorithms with digital signatures as a key, indicates that the size of the encrypted file is equal to the size of the plaintext, not to be larger or smaller so that the time required for encryption and decryption process is relatively fast.
Implementasi Aplikasi Google Classroom Dalam Pembelajaran Daring Masa Pandemi Covid-19 Di SMP Swasta Bahalbatu Tahun Ajaran 2021/2022 Grace Lamudur Arta Sihombing
Jurnal Christian Humaniora Vol 6, No 1 (2022): Mei 2022
Publisher : Institut Agama Kristen Negeri Tarutung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46965/jch.v6i1.902

Abstract

Abstract:The aims of this research are :(1) to find out how to implement the application google classroom on online learning mathematics during the Pandemic, and (2) To find out student learning outcomes in implementing the google classroom in online learning mathematics during the Covid-19 pandemic. This research was conducted by SMP Swasta Bahalbatu, the subjects in this study were the headmaster, mathematics teacher, students of class VIII A totaling 32 people. The method used in this research is to use a qualitative approach with a descriptive method. Data collection techniques used are observation, interviews, documentation and tests in the form of essays. Data analysis techniques consist of data reduction, data presentation, and drawing conclusions. The results of the study revealed that: (1) the implementation of the google classroom application in online learning on mathematics subjects during the Covid-19 pandemic, which showed that from all aspects of student learning activities an average score of 1.12 was obtained with the criteria not being implemented and aspects of teacher teaching creativity. obtained an average value of 3.60 with very implemented criteria. (2) the mathematics learning outcomes of students class VIII A implementing the google classroom application in online learning mathematics during the Covid-19 Pandemic at SMP Swasta Bahalbatu from 32 students there were 18 students who completed with an average score of 57.03 and a percentage of completeness 56.25% and included in the poor category.Keywords: google classroom, online learningAbstrak:Penelitian bertujuan untuk : (1) untuk mengetahui bagaimana implementasi aplikasi google classroom pada pembelajaran online pada masa Pandemi covid 19, dan (2) Untuk mengetahui Hasil Belajar siswa dalam mengimplementasikan aplikasi google classroom pada pembelajaran online mata pelajaran matematika pada masa Pandemi Covid-19. Penelitian ini dilaksanakan di SMP Swasta Bahalbatu, subjek dalam penelitian ini adalah Kepala Sekolah, Guru matematika, siswa kelas VIII A yang berjumlah 32 orang. Metode yang dilakukan dalam penelitian ini adalah menggunakan pendekatan kualitatif dengan metode deskriptif. Teknik pengumpulan data yang digunakan adalah observasi, wawancara, dokumentasi dan tes berupa Essay. Teknik analisis data terdiri dari reduksi data, penyajian data, dan penarikan kesimpulan. Hasil penelitian mengungkapkan bahwa: (1) implementasi aplikasi google classroom dalam pembelajaran online pada mata pelajaran matematika masa Pandemi Covid-19 menunjukkan bahwa dari keseluruhan aspek aktivitas belajar siswa diperoleh nilai rata-rata 1,12 dengan  kriteria kurang terlaksana dan aspek kreativitas mengajar guru diperoleh nilai rata-rata 3,60  dengan  kriteria sangat terlaksana. (2) hasil belajar siswa kelas VIII A pada mengimplementasikan aplikasi google classroom pada pembelajaran online matematika masa Pandemi Covid-19 di SMP Swasta Bahalbatu dari 32 siswa terdapat 18 siswa yang tuntas dengan skor rata-ratanya 57,03 dan persentase ketuntasan  56,25% dan termasuk  dalam kategori kurang baik.Kata Kunci: aplikasi google classroom, pembelajaran online
Co-Authors Enda Dwi Karina Tetti Manullang