Judul: Analisis keamanan kriptosistem kunci publik RSA
Abstrak: Seiring dengan meningkatnya penggunaan jalur komunikasi urnum sebagai fasilitas untuk melakukan komunikasi dan pertukaran pesan atau data, menyebabkan metode pengamanan pesan menjadi sangat penting. Salah satu metode yang dapat digunakan untuk mengamankan pesan adalah teknik kriptografi. Dalam kriptografi dipelajari beberapa teknik matematika berkaitan dengan aspek kearnanan informasi. Berdasarkan tipe kuneinya teknik kriplografi dibedakan menjadi dua, yaitu simetri dan asimetrilpublik. Keduanya menggunakan kunei unluk pengarnankan pesannya, bedanya, pada kunei simetri digunakan kunei yang sarna untuk enkripsi dan dekripsi, sedangkan pada kunei asimetri digunakan kunei yang berbeda. Pada tulisan ini akan dibahas salah satu metode dari tipe kunei asimetri, yaitu RSA. Tulisan ini bertujuan untuk mempelajari dan menganalisis a1goritma RSA serta beberapa kemungkinan serangan yang dapat dilakukan oleh musah terhadap kriptosistem ini. Bila beberapa serangan-serangan diprediksi akan teIjadi, maka harus diantisipasi dengan menenlukan a1gorilma RSA dengan karakteristik kunei tertentu yang eukup tahan dan arnan berada pada jalur komunikasi umum, walau memang serangan-serangan tersebut teIjadi. Hasil dari penganalisaan menunjukan bahwa inti kemanan RSA adalah pada masalah RSA dan faktorisasi bilangan komposit. Dengan menghindari kemungkinan dari a1goritma faktorisasi maka didapat algoritma RSAyang eukup tahan dan arnan dalarnjalur komunikasi urnum.
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Judul: Factoring RSA Keys with Quadratic Sieve Method
Abstrak: Data yang dikirim melalui jaringan tidak jarang disadap oleh orang lain untuk kepentingan tertentu. Oleh karena itu, data harus dienkripsi sebelum dikirim. RSA (Rivest Samir Adleman) adalah salah satu metode kriptografi kunci publik untuk mengenkripsi data. Keamanan algoritme ini terletak pada sulitnya memfaktorkan bilangan bulat positif yang besar menjadi faktor prima. Pemfaktoran dilakukan untuk memperoleh kunci privat. Dalam skripsi ini kita mempelajari salah satu metode faktorisasi disebut penyaringan kuadratik. Pada metode ini, pemilihan nilai B,disebut faktor basis, akan sangat berpengaruh pada proses komputasi. Kata Kunci : kriptografi RSA, metode penyaringan kuadratik.
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Judul: Utilization of hydrolized duckweed (Lemna minor) meal as a soybean replacement in Nile tilapia (Oreochromis niloticus) diet,
Abstrak: Tilapia is a fast growing fish widely cultured in many tropical and sub tropical countries. The recent production figures reported our global production estimates for 2015 is 5,576.8 metric tons. In developing countries the major challenges facing aquaculture industry is high cost of production associated with fish feeds. Feed represents 40-70% of operating costs for aquaculture operations, increasing expenses and potential declining supplies soybean meal have led scientists to search for less expensive but compatible alternative protein sources for fish feed; most of which are based on animal or plant protein sources. The objectives of study was to determine the incubation period for hydrolysis of duckweed and to evaluate the use of hydrolized duckweed as aprotein source for the growth performance of Nile tilapia Three experiments were conducted to determine the composition and digestibility of hydrolyzed duckweed meal by sheep rumen liquor as the replacement of soybean meal in the diet of Nile tilapia. The first trial examined the effectivity of sheep rumen liquor enzyme to decrease crude fiber contents of (DWM), the added volume of sheep rumen liquor was 100 ml/kg DWM and then it was incubated for 0, 12, 24 hr . The second trial was to evaluate the apparent digestibility of hydrolyzed DWM for Nile Tilapia, apparent digestibility were determined using chromic oxide indicator added to both reference diet and test diets. The feed ingredients used in the trial were hydrolyzed DWM (HDWM) and unhydrolyzed DWM (DWM). Ten fish with an average weight of 18±0.36g were used in the trial and reared in the aquarium of size 30×40×50cm for 15 days; feces were collected from three replicates using a fecal collection column attached to the aquarium. Third trial was to evaluate the growth performance of Tilapia fed test diet with hydrolyzed Duckweed meal (HDWM). The experimental design was set according to completely randomized design with four treatments and three replicates of HDWM inclusion levels that is 0%, 15%, 30% and 45%. Nile tilapia fish with initial body weight of 18±0.36g was kept in 12 units aquarium size of 30×40×50cm at stocking density of 10fish/aquarium, the fish were fed two times a day at 08:00am and 16:00pm to apparent satiation for a period of 60 days. The results indicated that duckweed meal (DWM) hydrolyzed with 100 mL/kg and incubated for 24 hrs showed the lowest crude fiber contents of 13.68% compared to other treatments. Total digestibility of hydrolyzed duckweed (HDWM) meal was 87.3% compared with unhydrolyzed duckweed (DWM) which was 66.8%. Total final weight (TFW), survival rate (SR), specific growth rate (SGR), feed conversional rate (FCR) and protein retention (PR) shows growth performance at 15% inclusion. The results of this study showed that 100mL/kg sheep rumen liquor at incubation period of 24 hr can be suitable for hydrolysis of duckweed to reduce crude fiber also hydrolyzed duckweed can substitute soybean meal at an incubation rate of 15% in the diet of Nile tilapia and had the same growth and FCR with control diet
Keyword: Digestibility, Duckweed meal, Growth performance, Sheep rumen