Judul: Analisis kuantitatif, kekerasan dan pengaruh steganografi berbasis least significant bit (LSB) pada gambar dengan penyisipan berukuran variabel
Abstrak: Saat ini internet sudah berkembang menjadi salah satu media yang paling populer di dunia. Karena fasilitas dan kemudahan yang dimiliki oleh internet, maka internet untuk saat ini sudah menjadi barang yang tidak asing lagi. Sayangnya dengan berkembangnya internet dan aplikasi menggunakan internet semakin berkembang pula kejahatan sistem informasi. Dengan berbagai teknik, banyak yang mencoba untuk mengakses informasi yang bukan haknya. Maka dari itu, sejalan dengan berkembangnya media internet ini harus juga dibarengi dengan perkembangan pengamanan sistem informasi. Salah satu teknik pengamanan informasi yang dapat dilakukan adalah dengan menerapkan steganografi berbasis Least Significant Bit (LSB) dengan penyisipan berukuran variabel yang bertujuan mamaksimumkan kapasitas penyisipan dari media covernya. Teknik steganografi ini menggunakan tiga komponen seperti yang dikemukakan oleh Yeuan-Kuen Lee dan Ling Hwei Chen. Ketiga komponen tersebut yaitu, Capacity Evaluation (CE) yang bertujuan menentukan kapasitas maksimum LSB dari masing-masing pixel cover, Minimum Error Replacement (MER) yang dipakai untuk memperkecil tingkat kesalahan saat penyisipan, dan Improved Grayscale Compensation (IGSC) yang digunakan untuk memisahkan kesalahan penempelan agar tidak berdekatan pada tempat pixel bekerja
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Judul: Implementation of Steganography on Text Media using Line-Shift Coding Method and Centroid Method.
Abstrak: Steganography is an information hiding technique using a certain media, such as text, sound, and images to make the message looks like another form. Nowadays, steganography is being widely used on digital document. Along with the increased use, type of attack that is used to take or damage the message done by the other parties become varies, for example, the use of scanner and printer to print a digital document with the purpose to erase the messages that have been inserted in the document. Therefore, it’s necessary that the steganography method being used has to be resistant to the process of printing and scanning, one of which is line-shift coding method. Line-shift coding method is a method that adding series bits of message in the document by moving even line in a paragraph vertically. Research was conducted to apply this method in the PostScript document. Results from this research include the estimation analysis for the size of messages that can be inserted in several different font sizes. When the font size is larger, it can be estimated that the characters of message that can be inserted are increased. In this research, line-shift coding method is proven resistant to the printing process, the difference in the quality of printing, which are fast normal (300 dpi), best (600 dpi), and maximum dpi (1200 dpi), a photocopy process up to two times, and resizing image attack to 700 * 963 pixels and up. Yet, this method has fail to pass resizing image attack up to 700 * 963 pixel, different slope angle attack and the cutting image attack. Keywords: steganography on text, Line-Shift Coding method, Centroid method.
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Judul: Studi Taksonomi Katak Subgenus Papurana (Lesson, 1831) dari Halmahera (Anura, Ranidae, Hylarana), Studi Taksonomi Katak Subgenus Papurana (Lesson, 1831) dari Halmahera (Anura, Ranidae, Hylarana
Abstrak: I reevaluated taxonomic of subgenus Papurana position from Halmahera based on morphological and molecular analyses. My results show that two separate species occur on the Halmahera Island, each nested within two distinct clades (hereafter papua clade and celebensis clade), one of which corresponds to H. moluccana (celebensis clade) and the other to an unidentified species (papua clade). By p-distance ranging from 6.9 to 11.5% on the 16S rRNA gene, the unidentified species (Hylarana sp.) is genetically different from all congeners of the papua clade. The Hylarana sp. can be distinguished from all congeners by following combination of charactes: vomer teeth in two oblique rows with narrow inter-vomer distance; snout rounded dorsally; dorsum with few scattered cone-shaped tubercles that are black with white tips; distinct skin folds (ridges) on the dorsal side of the thigh coinciding with dark brown cross bars; a marbled pattern on the ventral side of the thigh and yellowish groin. I also present new data for H. daemeli, H. volkerjane, and H. arfaki from the western region of Papua. Furthermore, I found that H. celebensis has numerous mtDNA lineages, indicating cryptic diversity within the celebensis clade. The discovery of two separate species on Halmahera necessitates more research into the biogeographic history of Hylarana in Northern Moluccas.
Keyword: frog, Halmahera, Hylarana, morphology, Papurana, phylogenetic