Judul: ANTIOXIDANT ACTIVITY OF INSTANT BROWN RICE (Oryza  nivara) AND GREEN BEAN (Vigna radiata (L.) W) POWDER  DRINK FORMULATION USING DRUM DRYER
Abstrak: Brown rice (Oryza nivara) and green beans (Vigna radiata) have high phytochemical content and antioxidant activity. This study aimed to measure the antioxidant activity of brown rice and green bean powder formulated drinks using the Drum Dryer method in supporting human health. The method used to dissolve this sample was by maceration using methanol and 1% HCl as a solvent then the sample was evaporated using a rotary vacuum evaporator. The results of this research were that the highest yield was the BKM 1:3 sample with a ratio of brown rice : green beans of 25:75, with value 8.2%. The results of the evaluation of the value of total phenolic content and antioxidant activity in the types of formulated drink samples show that the BKM 1:3 type sample with a greater concentration ratio of green beans than brown rice, 25:75, has a high value compared to other formulated drink samples, where as The evaluation of total anthocyanin content values showed that high values were obtained in the BKM 3:1 beverage sample formulation with a concentration ratio of brown rice and green beans of 75:25. In the hedonic test results, the drink formulation most accepted by the panelists was the BKM 1:1 type drink sample with a 50:50 ratio of brown rice and green beans. The conclusion from this research is that the influence of temperature and the mixed ingredients added to the drink formulation of brown rice powder and green beans have a significant effect on antioxidant activity.
Keyword: antioxidant, drum dryer, powder drink, Oryza nivara, Vigna radiata

Judul: Development of Potentially Functional Drink from Skimmed Milk Enriched with Red or Black Variety Rice Bran
Abstrak: Rice bran is a good source of antioxidants such as polyphenol compounds that are potentially formulated in skimmed milk drink. The objectives of this research were to develop potentially functional drink from skimmed milk enriched with red or black variety rice bran and to evaluate their physical, chemical and sensory qualities. The milk drinks were formulated with skimmed milk (95%) and sucrose (5%) as fixed formula. Considering the result of preliminary research, the addition of red or black variety rice bran at amount of 4, 6, 8% (w/w) and carboxy methyl cellulose (CMC) at amount of 0, 0.05, 0.1% (w/w) were based on fixed formula and water addition in ratio 4:1 (w/w) of water weight and total weight of skimmed milk powder, sucrose, rice bran, and CMC. The milk drink formula was selected based on total phenolic content (TPC), total anthocyanin content (TAC) and its antioxidant activities using DPPH and FRAP assay. Two selected formulas were characterized in terms of physical properties (viscosity and colour), chemical properties (pH, total soluble solid, and proximate), and sensory evaluation by rating hedonic. Red and black variety rice bran had high TPC with amount 512.19±43.91 and 1247.56±196.34 mg GAE/100 g, TAC with amount 1.94±0.19 and 40.69±4.21 mg C-3-G/100 g, respectively. Red and black variety rice bran also showed antioxidant activity based on DPPH assay (106.68±13.49 and 209.93±19.75 mmol Trolox/100 g, respectively) and FRAP assay (8.04±0.39 and 14.66±0.56 mmol FeSO4/100 g, respectively). The milk drink enriched with red variety rice bran, the highest content of TPC (33.83±1.00 mg GAE/100 mL), TAC (1.86±0.32 mg C-3-G/L), and antioxidant activities of DPPH (83.38±1.37 mmol Trolox/100 mL) and FRAP (0.43±0.01 mmol FeSO4/100 mL) by addition of 8% red variety rice bran and 0.05% CMC. The milk drink enriched with 8% black variety rice bran and 0.1% CMC showed the highest values in TPC (39.61±0.11 mg GAE/100 mL), DPPH (196.22±3.77 mmol Trolox/100 mL), FRAP (0.63±0.07 mmol FeSO4/ 100 mL) and TAC (5.53±0.03 mg C-3-G/L). Furthermore, the proximate analysis showed that the selected drinks had low fat content and high fiber content. Both milk drinks also were moderately liked on overall liking attribute. Based on its TPC, TAC and antioxidant activities, these milk drinks enriched with black and red variety rice bran are potentially developed as functional drinks.
Keyword: antioxidant activity, black and red variety rice bran, functional milk drink, skimmed milk

Judul: Konstruksi aritmetika kurva eliptik F(2m) supersingular dan non-supersingular untuk skema kunci publik ElGamal
Abstrak: Algoritme ElGamal adalah salah satu algoritme kunci publik dengan aritmetik modular p yang mempunyai struktur grip siklik Z(p). Tingkat keanaman algoritme ini terletak pada pemecahan masalah logaritme diskret dari Z(p). Akan tetapi, tingkat keamanan tadi tahun ke tahun semakin menurun yang disebabkan kemampuan pemecahan algoritme diskret semakin meningkat. Untuk memenuhi tingkat keamanan yang memadai dibutuhkan p yang cukup besar yang menyebabkan proses enkripsi dan dekripsi menjadi lambat.
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