Judul: Implementasi Kriptografi Visual pada Citra Berwarna Menggunakan Metode Youmaran
Abstrak: Visual cryptography was introduced in 1995 by Moni Naor and Adi Shamir. From that moment visual cryptography has grown. Visual cryptography scheme has changed from the most simple technique which can be decrypted by human visual system until advanced techniques that need computer assistance on decryption process. Visual cryptography was firstly used for binary images, but now it can be used in color images. One of the methods that can be used in visual cryptography for the color image is Youmaran's method. The aim of this research is implementing visual cryptography using Youmaran's method and then analyzing it. This research uses maximum foul' cover images to hide plain image. This research uses Mersenne Twister algorithm to generate random numbers for encryption and decryption process. This research also calculates the PSNR value of the decrypted image. The result from this research indicates that using visual cryptography with Youmaran's method can hide an image in other images. With this method, human eye will not know that in fact there is an image inside the camouflage images.
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Judul: Analisis Beragam Skenario Enkripsi pada Gambar Digital Berwarna Menggunakan Algoritme Data Encryption Standard (DES)
Abstrak: Cryptographic techniques are widely applied to maintain the confidentiality of a message. However, most cryptographic techniques are currently still being performed on the entire content of the message, so that they require high computation time. Therefore, in this research we designed several test scenarios to encrypt partially the contents of the messages which can lead to faster computation while still maintaining the quality of information confidentiality. In this research, we used BMP image files of digital color photographs with color depth 24-bit consisting of three different objects. Encryption technique used is Data Encryption Standard (DES) with operating mode Electronic Codebook (ECB). Analysis is performed on computation time and quality of the encryption of each scenario. The quality of encryption is computed using Peak Signal to Noise Ratio (PSNR) and a survey to 30 respondents. Respondents will compare the original image file (plaintext) and encrypted image (ciphertext). Results of the analysis showed that the computation time is not only affected by the resolution of image files but also by the choice of the encryption scenarios. The encryption with the best, indicated by the smallest PSNR values was generated by the scenario 1 (scenario full) with the average value of 33,62 dB, while the largest PSNR value was generated on the scenario 8 (head section) with an average value of 39,67 dB. Encryption quality visually assessed based on the results of the survey. The results of the survey concluded that, the best encryption quality was achieved in scenario 1 with a value of 93,33%, and the worst in scenario 7 (bottom scenario) with a value of 28%. In this research, the computation time of scenario 8 is one third of the computation time of scenario 1. Conclusions obtained from this research is that by applying the appropriate encryption scenario, shorter computation time can be achived while maintaining effective encryption.
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Judul: Definisi zat besi ( Fe ) pada anak babi
Abstrak: Dalam bidang sub sektor peternakan, ternak babi mempunyai prospek yang cukup baik untuk dikembangkan dalam rangka meningkatkan eksport non migas. Namun anak-anak babi yang sedang menyusu sering mengalami defisiensi zat besi (Fe). Bila masalah ini tidak segera ditanggulangi, peternak akan mengalami kerugian. Zat besi dapat diperoleh dari makanan yang berasal dari hewan (tepung tulang, tepung ikan, tepung daging, "skimmed milk"); tumbuh-tumbuhan (leguminosae, rumput-rumputan, biji-bijian) dan mineral alam (Girindra, 1979). Dalam tubuh hewan, zat besi berperanan sebagai pembawa 02 ke seluruh jaringan, juga sebagai pembawa oksigen pernafasan di dalam sel urat daging (Underwood, 1981). Dalam duodenum dan yeyenum bagian atas, besi dalam bentuk ferro akan diserap. Penyerapan ini akan diatur berdasarkan teori "mucosal block" dari Granick. Kemudian dalam plasma darah, besi akan berikatan dengan B₁ globulin dan membentuk transferrin, yang akan segera dibawa ke seluruh jaringan. Kelebihan besi akan diikat oleh apoferritin dan membentuk ferritin yang ditimbun sebagai besi cadangan, terutama di hati. Bila kapasitas besi yang dapat disimpan sebagai ferritin telah jenuh, maka besi akan ditimbun sebagai hemosiderin. Zat besi dalam jumlah yang sedikit akan diekskresikan melalui pengelupas- an epitil, tinja, air kemih, cairan empedu, keringat. ...
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