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All Journal Indonesian Journal of Community Empowerment Jurnal Informatika dan Multimedia
Maulana, Dikri
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Humanities Computer Science & IT Decision Sciences, Operations Research & Management Languange, Linguistic, Communication & Media Social Sciences Other

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Analisis Kinerja Kompresi Huffman dan BWT pada Steganografi dalam Reduksi Ukuran Gambar Maulana, Dikri; Rahmatulloh, Alam
Jurnal Informatika dan Multimedia Vol. 17 No. 1 (2025): Jurnal Informatika dan Multimedia
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jtim.v17i1.6597

Abstract

Keamanan data menjadi isu krusial dalam era digital, terutama ketika data sensitif harus dikirim atau disimpan di lingkungan yang tidak aman. Penelitian ini bertujuan untuk menganalisis kinerja kombinasi metode kriptografi Advanced Encryption Standard (AES), steganografi End of File (EOF), serta kompresi lossless dalam reduksi ukuran gambar. Tiga skenario diuji: (1) tanpa kompresi, (2) dengan kompresi Huffman Encoding, dan (3) dengan kompresi Burrows-Wheeler Transform (BWT). Proses dimulai dengan kompresi main image menggunakan algoritma Burrows-Wheeler Transform (BWT) atau Huffman Encoding, dilanjutkan dengan enkripsi menggunakan AES, dan diakhiri dengan penyisipan gambar utama yang telah terenkripsi ke dalam cover image menggunakan metode steganografi EOF. Hasil menunjukkan bahwa ukuran file tanpa kompresi rata-rata mencapai 1.265.673 bytes. Penggunaan metode kompresi Huffman menghasilkan pengurangan ukuran file rata-rata sebesar 1,39%, dengan ukuran file rata-rata menjadi 1.230.213 bytes. Sementara itu, metode BWT menunjukkan kinerja terbaik, dengan pengurangan ukuran rata-rata sebesar 5,48% dan ukuran file rata-rata sebesar 1.187.186 bytes. Temuan ini menunjukkan bahwa meskipun Huffman dapat mengurangi ukuran file, metode BWT jauh lebih efektif dalam mengidentifikasi pola data, sehingga menghasilkan file yang lebih kecil.
Optimizing the Role of Mathematics Teachers in Developing HOTS (Higher Order Thinking Skills) Based Questions Through Research-Based Learning Outcome Analysis Puspitasari, Nitta; Kurniati, Dian; Maulana, Dikri; Hidayah, Fauzia Nurul
Indonesian Journal of Community Empowerment (IJCE) Vol 5 No 4 (2024): Indonesian Journal of Community Empowerment (November)
Publisher : Fakultas Kewirausahaan Universitas Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35899/ijce.v5i4.1058

Abstract

This community service activity aims to optimize the role of mathematics teachers in developing Higher Order Thinking Skills (HOTS)-based questions through research-based learning outcome analysis. The background of this activity lies in the limited ability of teachers to design assessment instruments that demand higher-order thinking, resulting in learning processes that tend to focus on memorization and basic comprehension. The method applied in this program was a descriptive approach, implemented through training, mentoring, and question analysis workshops involving mathematics teachers at the secondary school level. The program emphasized the understanding of HOTS concepts, the development of questions based on the revised Bloom’s taxonomy, and the analysis of student learning outcomes to assess the effectiveness of the developed instruments. The results showed that teachers were able to improve their skills in designing HOTS-based questions while gaining a more objective picture of student achievement. Therefore, this program is expected to strengthen teachers’ capacity in supporting more meaningful, challenging, and relevant learning aligned with curriculum demands and 21st-century competence needs.
Co-Authors Alam Rahmatulloh Dian Kurniati Hidayah, Fauzia Nurul Puspitasari, Nitta