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All Journal Techno.Com: Jurnal Teknologi Informasi DE JURE Jurnal Nasional Komputasi dan Teknologi Informasi JURIS (Jurnal Ilmiah Syariah) JATI (Jurnal Mahasiswa Teknik Informatika) Indonesian Journal of Electrical Engineering and Computer Science Jurnal Computer Science and Information Technology (CoSciTech) JITER-PM (Jurnal Inovasi Terapan - Pengabdian Masyarakat) Jurnal Kegiatan Pengabdian Mahasiswa (JKPM)
Fatma, Yulia
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Journal : Jurnal Computer Science and Information Technology (CoSciTech)

 1 
Analisis keamanan steganografi teks dengan metode lsb (least significant bit) pada citra digital Aqilah Syaima' Fadel; Rianto David Saputra; Fatma, Yulia; Risky Nanda Putra
Computer Science and Information Technology Vol 5 No 1 (2024): Jurnal Computer Science and Information Technology (CoSciTech)
Publisher : Universitas Muhammadiyah Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37859/coscitech.v5i1.6759

Abstract

Perkembangan teknologi yang cepat membuka kemungkinan bagi pihak-pihak tidak berkepentingan untuk mengekstraksi pesan dari media cover. Oleh karena itu, diperlukan langkah-langkah keamanan tambahan untuk melindungi pesan yang disembunyikan. Penelitian sebelumnya telah mengusulkan penggabungan teknik steganografi dan kriptografi. Kriptografi, sebagai teknik untuk mengamankan pesan, dapat diklasifikasikan menjadi modern dan klasik berdasarkan waktu kemunculannya. Jenis kuncinya meliputi kriptografi simetris dan asimetris dengan beberapa algoritma populer seperti Rivest Cipher 4 (RC4), Data Encryption Standard (DES), dan Advanced Encryption Standard (AES). Steganografi yang merupakan seni dan ilmu menyembunyikan pesan, menjadi penting untuk menjaga kerahasiaan dan keamanan data dan informasi. Meskipun kelebihan pengiriman data melalui internet, terdapat kelemahan seperti kejahatan siber, termasuk penyadapan dan perubahan data. Metode Least Significant Bit (LSB) adalah strategi terkenal dalam steganografi, terutama dengan menggunakan LSB dari data piksel gambar. Metode ini memberikan keamanan tinggi dan dapat menyesuaikan teknik penyematan tanpa kehilangan informasi akibat kompresi dan perubahan yang tidak terlihat dalam steganografi gambar. Pentingnya menggunakan format kompresi tanpa kehilangan (lossless) saat menggunakan metode LSB diilustrasikan dalam kompresi stego image. Penggunaan format kompresi yang mengalami kehilangan (lossy) dapat mengakibatkan kehilangan pesan rahasia. Meskipun steganografi LSB umum digunakan karena kesederhanaannya, metode ini rentan terhadap deteksi oleh algoritma analisis steganografi yang canggih. Penelitian ini menyoroti keterbatasan dalam kapasitas penyembunyian informasi dan risiko keamanan yang perlu mendapatkan perhatian.
Perbandingan Algoritma SIMON dan SPECK Dalam Pengamanan Citra Digital Fatma, Yulia; Soni; Mikdad Amseno
Computer Science and Information Technology Vol 5 No 3 (2024): Jurnal Computer Science and Information Technology (CoSciTech)
Publisher : Universitas Muhammadiyah Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37859/coscitech.v5i2.7619

Abstract

Cryptography is a data security technique by encoding data that is to be kept secret so that the original meaning of the data can no longer be understood. SIMON and SPECK are modern cryptographic algorithms issued by the National Security Agency (NSA). SIMON and SPECK are said to be algorithms that are known for their efficiency and strong security. This research will compare the performance of the SIMON and SPECK algorithms in securing digital images. Comparisons were made by testing time performance, changes in file size, and the level of randomness of image files using the Unified Average Changing Intensity (UACI) and Number of Pixels Change Rate (NPCR) metrics. The research results show that the average encryption and decryption time required by the SIMON algorithm is greater when compared to the SPECK algorithm. The image file size resulting from encryption using the SIMON and SPECK algorithms both increased by 24% from the original image. The level of randomness of the resulting image based on the UACI value obtained using the SIMON algorithm was found to be an average of 19.65%, while the UACI value obtained using the SPECK algorithm was an average of 20.94%. This shows that there is a significant change in intensity between the original image and the encrypted image. However, not all pixels in the encrypted image change when compared to the original image, this is shown by the NPCR value obtained from the SIMON and SPECK algorithm encrypted image, with average results of 49.98% and 50.17%.
Co-Authors Agusriadi, - Al Amien, Januar Ananda, Putri Aqilah Syaima' Fadel Arif Fernandes, Yoggy Arviero L Tobing, Yandi Dermawan, Aldi Evans Fuad Galih Anggoro, Hendar Harun Mukhtar Heru Sandi, Ganesa Jamilah, Zahratul Marcelino, Ananda Mikdad Amseno Mohamad, Mohd Saberi Muslimin, JM. Nurlela Nurlela Prayoga, Yuda Rahma Dayani, Lilian Rahmad Firdaus Remli, Muhammad Akmal Rianto David Saputra Risky Nanda Putra Rizki, Yoze Ropiansyah, Annoza Rosita Wati SLAMET MUJIONO, SLAMET Soni Tiara Putri, Rahma Triana Dahar, Ulya Widia Lestari