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: Steganografi Video Dengan Menggunakan Metode Discrete Cosine Transform (DCT)
Abstrak: Information security nowadays has become a very important thing to note. A lot of confidential information such as personal data, financial data, and even state secrets confidential data needs to be protected so it cannot be misused by other people who are not authorized to do so. There are various methods to protect certain information, such as with cryptography and steganography. Cryptography change the original message into a meaningless message. This is important because with meaningless message, an unauthorized person can not know the contents of the message. But with the message is not meaningful, people would suspect that there is a hidden secret information inside the message and will try to break it. Therefore, this suspicion must be avoided and a suitable method to avoid suspicion is steganography which disguise a message so that its presence is not recognized by the other people. This research is about steganography applied in video using DCT method. Basically this method is modifying the DC coefficient bits in each byte of cover file. Text messages was inserted into video of .avi type format and then the message was retrieved from the video file. From the test results, it can be proved that the DCT method can be implemented in a video steganography. This method can qualify most criteria of steganography such as imperceptible, fidelity and recovery but not yet qualify the criteria of robustness. Nevertheless, there is still plenty of space that can be used in conducting the development of video steganography using DCT.
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Judul: Karakteristik Kayu Jati Inti Umur 8 Tahun Asal Pulau Muna.
Abstrak: Kayu jati, termasuk jati Muna, hingga saat ini digunakan sebagai bahan baku mebel bermutu tinggi. Ketersediaannya yang semakin terbatas dan semakin mahal mengakibatkan dikembangkannya bibit jati cepat tumbuh yang berasal dari pohon plus yang dipaparkan sinar gamma (jati inti). Penelitian ini bertujuan untuk mempelajari karakteristik kayu jati inti umur 8 tahun asal Pulau Muna. Contoh uji berupa disk dan papan dari bagian pangkal tiga batang pohon jati dengan diameter yang berbeda. Sifat yang diuji meliputi struktur anatomi dan beberapa sifat fisis-mekanis. Hasil penelitian menunjukkan bahwa struktur anatomi kayu jati inti relatif sama dengan struktur anatomi kayu jati pada umumnya, namun porsi terasnya tergolong tinggi (73.41%). Kadar air (KA) kayu kondisi segar (74.05%) lebih rendah dari KA kayu jati cepat tumbuh yang seumur. Kayu lebih stabil (T/R rasio = 1.23) dibandingkan kayu jati pada umumnya, namun berat jenis (BJ)-nya (0.52) lebih rendah dari BJ kayu jati tua. Sifat mekanisnya lebih tinggi dibandingkan sifat sejenis pada kayu jati cepat tumbuh, tetapi lebih rendah dibandingkan dengan yang terdapat pada kayu jati tua. Berdasarkan nilai BJ kayu, maka kayu jati inti Muna ini masuk ke dalam Kelas Kuat III.
Keyword: Jati inti, Pulau Muna, sifat fisis, sifat mekanis, struktur anatomi