Judul: Budidaya Tanaman Akar Wangi (Vetiveria zizanioides (L.) Nash) dalam Wadah: Pengaruh Komposisi Media Tanam dan Jumlah Bibit.
Abstrak: The objectives of this experiment were to determine the effect of media composition and the number of seedlings planted on the growth of hydroponically grown vetiver (Vetiveria zizanioides). Vetiver ‘Verina 2’ variety was grown in polybags in a greenhouse of the Cikabayan Bawah Experimental Farm (240 m above sea level) started from November 2012 to July 2013. This experiment was arranged in a randomized complete block design with two factors and five replications. The first factor was media composition (v/v), consisted of three levels i.e. 100% charchoal husk, charcoal husk : styrofoam (2:1), and charcoal husk : styrofoam (1:1). The second factor was the number of seedlings in one polybag consisted of one seedling and two seedlings. The results showed that there were no interaction effects of media composition and number of seedlings planted to plant growth and root growth of vetiver. Plants grown in charcoal husk : styrofoam (1:1) medium had significantly higher number of plants per cluster, higher number of leaves, higher chlorophyll and carotenoid contents, higher number of roots, and longer primary roots than those in other media compositions. Planting two seedlings per polybag resulted in higher number of plant per cluster, higher number of leaves, higher shoot fresh and dry weight, and higher number of roots than one seedlings per polybag. These results showed that planting two seedlings in polybag containing charcoal husk : styrofoam (1:1) resulted in the best vegetative growth and root growth of vetiver.
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Judul: Pertumbuhan dan produksi tanaman akar wangi (Vetiveria zizanioides L. Nash) secara hidroponik pada beberapa komposisi media tanam
Abstrak: This research aimed to determine the effects of the growing media composition on the growth and production of vetiver (Vetiveria zizanioides L. Nash) in a hydroponic system. The research was started from December 2013 to February 2014 and conducted in a greenhouse of the Cikabayan Bawah with elevation of 240 meters above sea level. The research implemented the randomized block design (RBD) with 2 experiments: (1) uncutted root plants, (2) cutted root plants. A single factor used in the research is the growing media composition (v/v) that consists of 3 levels: 100% charcoal husk, charcoal husk:styrofoam (2:1), and charcoal husk:styrofoam (1:1). The results showed that the growing media composition significantly affected the height plants, fresh and dry matter weight of the uncutted root plants, the roots length of the cutted root plants. These research showed that the vetiver growing in the mixed materials (charcoal husk:styrofoam) has a better growth than the one growing in the single materials.
Keyword: Bogor Agricultural University (IPB), styrofoam, media compositions, charcoal husk

Judul: Protokol Pertukaran Kunci Berbasis Kriptosistem Kunci Publik Diffie-Hellman
Abstrak: Karya ilmiah ini menjelaskan teori-teori yang digunakan dalam protokol pertukaran kunci berbasis kriptosistem kunci publik Diffie-Hellman, mekanisme protokol tersebut dan menganalisis keamanan dari kriptosistem kunci publik Diffie-Hellman. Algoritme Diffie-Hellman merupakan salah satu protokol komunikasi dengan sistem kriptografi kunci asimetri atau kunci publik. Algoritma ini digunakan untuk mempertukarkan kunci rahasia bersama (kunci rahasia yang digunakan untuk komunikasi dengan menggunakan sistem kriptografi simetri) antara dua orang atau lebih. Tingkat keamanan dari algoritme Diffie-Hellman didasarkan pada masalah logaritma diskret bagi grup pergandaan bilangan bulat modulo prima. Karena tidak adanya proses autentifikasi dalam algoritme Diffie- Hellman, mengakibatkan algoritme ini rentan terhadap ancaman dari penyerang aktif dalam proses pertukaran kunci.
Keyword: Diffie-Hellman, kunci publik, kunci rahasia bersama, masalah logaritma diskret, pertukaran kunci