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: Penerapan dan Analisis Metode Discrete Cosine Transform (DCT) dengan Huffman Code pada Steganografi Video AVI
Abstrak: The use of digital data is increasingly encountered and began to replace analog media's role in various applications. Digital data has several advantages such as being easy in storage, duplication, processing, and distribution. Digital communication on the one hand strongly support the ease of message exchange transactions, but on the other hand has a higher risk of security, especially for confidential messages. Steganographic methods are used to hide secret messages in digital form into other digital media. This research proposed the implementation of steganography in AVI video using the Discrete Cosine Transform (DCT) technique. DCT is a method that will transform data from the spatial domain into the frequency domain and separates the data into two parts, namely the DC coefficient and AC coefficients. DCT-based steganography embed the text message in Least Significant Bits (LSB) of the DC coefficient. The test consists of subjective video quality analysis based on survey and objective testing using the Mean Structure Similarity (MSSIM), analysis of the data hiding validity, and the level of data hiding capacity. Huffman compression on the text is used to increase the capacity of the storage. In addition, using more bits of DC coefficients will further increase the capacity. The test result shows that the steganographic technique using DCT produces data hiding with level the of validity reaches 100%. In addition, the quality of the resulting video is still relatively good up to 4-LSB for message insertion. Also, it is known that the Huffman compression on the text message can reduce the processing time and increase the capacity of the insertion.
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Judul: Hubungan Litter Size dengan Bobot Lahir dan Mortalitas Anak Babi Tiga Hari Setelah Lahir
Abstrak: Ternak babi merupakan ternak yang dapat menghasilkan anak lebih banyak dibanding ternak lainnya (sapi, kerbau, domba, kambing, dan kuda). Oleh karena itu ternak babi memiliki suatu penampilan reproduksi yang unik. Bobot lahir anak babi akan mempengaruhi siklus kehidupan anak babi berikutnya. Banyaknya anak babi lahir per induk per kelahiran (litter size) juga akan mempengaruhi bobot lahir anak babi. Semakin banyak anak yang dilahirkan, bobot lahirnya pun semakin kecil. Mortalitas anak babi dapat terjadi saat anak babi memasuki waktu-waktu kritis setelah lahir. Litter size dan bobot lahir anak babi akan mempengaruhi mortalitas anak babi. Bobot lahir yang rendah akan meningkatkan mortalitas anak babi terutama tiga hari setelah lahir. Penelitian ini bertujuan untuk melihat seberapa jauh hubungan litter size dengan bobot lahir dan mortalitas anak babi tiga hari setelah lahir. Peubah yang diamati meliputi jumlah anak babi yang lahir seperindukan (litter size), bobot lahir anak babi, mortalitas anak babi, serta penyebab kematian anak babi tersebut. Penelitian ini dilaks anakan di petemakan babi PT. Prima Pig Farm, Kabupaten Sukoharjo, Jawa Tengah. Penelitian ini berlangsung selama dua bulan, dimulai dari bulan Juni sampai dengan Agustus 2004. Dilakukan pengamatan pada 38 induk bunting yang beranak selama bulan Juni sampai Agustus 2004. Semua induk babi dan masing-masing anak babi tersebut merupakan satuan unit percobaan. Dilakukan pengamatan terhadap litter size, berat lahir dan mortalitas (lahir mati, mumifikasi fetus, dan kematian tiga hari setelah lahir). Data yang diperoleh dianalisa dengan menggunakan analisis regresi dan Best Sufoel, yang sebelumnya data dikelompokkan menurut filler size yaitu kelompok litter size <10, 10-11, dan >11 ekor. Dengan analisis ir.i didapatkan suatu model regresi yang sesuai untuk antar peubah. Hasil penelitian ini menunjukkan, dari ketiga pengelompokan lifter size, kelompok filler size 10-11 ekor mempunyai hubungan yang lebih erat terhadap peubah lainnya. Dengan nilai koefisien keeratan 42, 1 %, kedua peubah be bas yaitu litter size dan bobot lahir anak babi saling mempengaruhi mortalitas anak babi selama tiga hari setelah lahir.
Keyword: lifter size, bobot lahir, mortalitas anak babi