Optimalisasi Penyusutan Exif Metadata Dengan Teknik Substitusi Null Value Pada Kasus Keamanan Citra Digital

Wijayanto, Hendro; Prabowo, Iwan Ady; Harsadi, Paulus

doi:10.30646/sinus.v16i1.327

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…Citra digital adalah salah satu jenis digital evidence yang memiliki risiko perubahan hingga menyebabkan adanya kerusakan dan kehilangan informasi yang sangat tinggi [1] Citra digital adalah sebuah representasi objek yang diolah di dalam perangkat komputer yang diperoleh dari beragam peranglkat digital [2]. Data pada citra digital berisi beragam informasi sehingga di dalam persidangan dan ranah digital forensik, citra digital digunakan sebagai barang bukti.…”

Section: Pendahuluanunclassified

Analisis Forensik Untuk Mendeteksi Keaslian Citra Digital Menggunakan Metode Nist

2020

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Currently, the changes in image quality resulting a low-resolution images, faded colors, and so on. This condition potentially attract irresponsible parties to take advantage of the situation for certain purposes. Nowadays, it is very easy for people to manipulate, change, or delete the original information from a digital image thus cause the authenticity and integrity of the image to be doubted. This study is conducted in a specific objective to prove the authenticity of a digital evidence for analysis by providing detailed illustrations of the role of Digital Forensics in accordance with applicable legal regulations in Indonesia using the NIST workflow. The research flow begins with uncovering the background of the problem, collecting data, making scenarios, applying the NIST method, and making conclusions. The illustration used in the scenario is a video inserted into a digital evidence. The video used in this research is the Cyanide Coffee Case with the suspect Wayan Mirna Salihin, happened in August 16, 2016 which was uploaded by Kompas TV channel on Youtube. The NIST analysis phases used several tools: Exiftools, Forevid, and Video Cleaner. The result indicates that all phases in the NIST method are correlated to each other. The result is specifically very clear in the collection phase. The discovery of hidden information causes the examination and analysis process to be more complex especially the extraction process of digital evidence in the form of images. Indeed, the use of various tools are more helpful in disclosing the existing information. This information can be seen from the results of metadata, hash value, and image sharpness from the analyzed digital evidence.

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Section: Pendahuluanunclassified

Analisis Forensik Untuk Mendeteksi Keaslian Citra Digital Menggunakan Metode Nist

2020

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“…Berkas jpeg/exif tersusun dari beberapa bagian yang disebut dengan segmen (Wijayanto, Prabowo, & Harsadi, 2018). Setiap segmen berfungsi sebagai kontainer data yang digunakan oleh komputer untuk menampilkan gambar.…”

Section: State Of the Artunclassified

Manajemen jpeg/exif file fingerprint dengan algoritma Brute Force string matching dan Hash Function SHA256

Fitriyanto

Yudhana

Sunardi

2019

register. jurnal. ilm. teknologi. sistem. inf.

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Management of jpeg/exif file fingerprint with Brute Force string matching algorithm and Hash Function SHA256Metode pengamanan berkas gambar jpeg/exif saat ini hanya mencakup aspek pencegahan, belum pada aspek deteksi integritas data. Digital Signature Algorithm (DSA) adalah metode kriptografi yang digunakan untuk memverifikasi integritas data menggunakan hash value. SHA256 merupakan hash function yang menghasilkan 256-bit hash value yang berfungsi sebagai file fingerprint. Penelitian ini bertujuan untuk menyusun file fingerprint dari berkas jpeg/exif menggunakan SHA256 dan algoritma Brute Force string matching untuk verifikasi integritas berkas jpeg/exif. Penelitian dilakukan dalam lima tahap. Tahap pertama adalah identifikasi struktur berkas jpeg/exif. Tahap kedua adalah akuisisi konten segmen. Tahap ketiga penghitungan hash value. Tahap keempat adalah eksperimen modifikasi berkas jpeg/exif. Tahap kelima adalah pemilihan elemen dan penyusunan file fingerprint. Hasil penelitian menunjukkan sebuah jpeg/exif file fingerprint tersusun atas tiga hash value. SOI (Start of Image) segment hash value digunakan untuk mendeteksi terjadinya modifikasi berkas dalam bentuk perubahan tipe berkas dan penambahan objek pada konten gambar. Hash value segmen APP1 digunakan untuk mendeteksi modifikasi pada metadata berkas. Hash value segmen SOF0 digunakan untuk mendeteksi gambar yang dimodifikasi dengan teknik recoloring, resizing, dan cropping. The method of securing jpeg/exif image files currently has covered only the prevention aspect instead of the data integrity detection aspect. Digital Signature Algorithm is a cryptographic method used to verify the data integrity using hash value. SHA256 is a hash function that produces a 256-bit hash value functioning as a fingerprint file. This study aimed at compiling fingerprint files from jpeg/exif files using SHA256 and Brute Force string matching algorithm to verify the integrity of jpeg/exif files. The research was conducted in five steps. The first step was identifying the jpeg/exif file structure. The second step was the acquisition of the segment content. The third step was calculating the hash value. The fourth step was the jpeg/exif file modification experiment. The fifth step was the selection of elements and compilation of fingerprint files. The obtained results showed a jpeg/exif fingerprint file which was compiled in three hash values. The hash value of SOI segment was used to detect the occurrence of file modification in the form of file type changing and object addition on the image content. The hash value of APP1 segment was used to detect the metadata file modification. The hash value of SOF0 segment was used to detect the images modified by recoloring, resizing, and cropping techniques.

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Optimalisasi Penyusutan Exif Metadata Dengan Teknik Substitusi Null Value Pada Kasus Keamanan Citra Digital

Cited by 2 publications

References 5 publications

Analisis Forensik Untuk Mendeteksi Keaslian Citra Digital Menggunakan Metode Nist

Analisis Forensik Untuk Mendeteksi Keaslian Citra Digital Menggunakan Metode Nist

Manajemen jpeg/exif file fingerprint dengan algoritma Brute Force string matching dan Hash Function SHA256

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