Judul: Analisis performance algoritme paralel block cipher RC6 menggunakan message passing interface (MPI)
Abstrak: RC6 algorithm is a block cipher algorithm, which is one of the finalists in the AES competition. One of the RC6 algorithm parameters is the size of the block, where a larger block size is used the more time required to perform encryption-decryption. In this research the RC6 algorithm would be parallelized by dividing the data to each processor and the performance of the RC6 algorithm would be analyzed. Parallel implementation of the RC6 algorithm uses Message Passing Interface (MPI). The purpose of this research is to measure and analyze the performance of parallel RC6 algorithm. This research uses 4 computer with Linux operating system. This research uses files ASCII text and binary for the experiment. Each file will do the experiment three times repetition to take the average value. The results of this research show that execution time of parallel RC6 algorithm at the process of encryption and decryption is longer than execution time of sequential RC6 algorithm. For example, for file size of 249,149,712 bytes, encryption execution time of sequential RC6 algorithm is 17.91 seconds, whereas using the number of processors as many as 2, 4, 6 and 8, respectively are as follows 18.34 seconds, 20.37 seconds, 17.51 seconds and 18.93 seconds. The results of encryption execution time show that the encryption execution time by using the processor number of 4 is the slowest one. The speedup of parallel RC6 algorithm is less than one or smaller than the speedup of sequential RC6 algorithm. The speedup of parallel RC6 algorithm also not ideal because ideally speedup is equal to the number of processors used. The efficiency of parallel RC6 algorithm becomes lower along with more processor used. The resulting efficiency is far away from the optimum efficiency value, that is one, and it is not constant. To maintain the efficiency values if the number of processors is increased from p to p ' the input size should be increased in fraction of p'2 / p2. The cost of parallel RC6 algorithm increases as more processors are used. The resulting cost greater than the optimal cost value that is equal to Ts. The resulting overhead values become greater when the number of processors are increased. The results of this research indicate that the RC6 algorithm is not good when it is parallelized with domain decomposition method and using MPI. This is because the RC6 algorithm has a fast computational process, but it has the long communication time, so the total execution time of parallel RC6 algorithm longer than sequential RC6 algorithm.
Keyword: block cipher, RC6 algorithm, parallel, Message Passing Interface (MPI), Linux, Performance metric, execution time, speedup, efficiency, isoefficiency

Judul: Analisis dan implementasi algoritme RSA secara paralel
Abstrak: RSA is an algorithm for public key cryptography. The advantage of RSA is it is difficult to be attacked. Besides that, RSA has shortcomings. For example, execution time of RSA algorithm is longer than other algorithms like DES and RC6. In this research the RSA algorithm would be parallelized by dividing the data to each processor and the performance of the RSA algorithm would be analyzed. Parallel implementation of the RSA algorithm uses Message Passing Interface (MPI).The objectives of this research is to measure and analyze the performance of parallel RSA algorithm using performance metrics. This research uses eight processors with Windows XP SP 2 as operating system. This research uses ASCII text and binary files for the experiment. The result of this research indicates that the RSA algorithm is good when it is parallelized using domain decomposition method because the RSA algorithm has a long computational process, but it has fast communication time. The best result of parallel RSA algorithm in this research is in decryption process. For example, for file size of 4.204.979 bytes, decryption execution time of sequential RSA algorithm is 4207.286 seconds, whereas using the eight process, respectively is 530.762 seconds. The speedup is 7.929 and the efficiency is 0.991. This result is good because ideally speedup is equal to the number of processors used and optimum efficiency is one. The worst result of parallel RSA algorithm is in encryption process with small file sizes. For example, for file size of 116.820 bytes, encryption execution time of sequential RSA algorithm is 0.292 seconds, whereas using the eight process, respectively is 0.066 seconds. The speedup is 4.419 and the efficiency is 0.567. This is because the RSA encryption in this research has a fast computational process, but it also has big overhead for data communication.
Keyword: RSA algorithm, Parallel, Message Passing Interface(MPI), Peformance metrics, Bogor Agricultural University, Institut Pertanian Bogor, IPB

Judul: Konsep Taman Rumah Adat Bagas Godang Berbasis Budaya Mandailing, Kabupaten Mandailing Natal, Sumatera Utara.
Abstrak: Kekayaan suatu bangsa tidak terbatas pada kekayaan sumber daya alamnya akan tetapi juga kekayaan budayanya. Taman rumah tradisional merupakan salah satu kekayaan budaya di Indonesia yang dapat menjadi identitas dari suatu budaya tersebut. Budaya Mandailing sudah dikenal sejak abad ke-14 M. Hal tersebut dibuktikan dengan penyebutan nama Mandailing di kitab Negara Kertagama, karangan Mpu Prapanca. Budaya Mandailing awalnya banyak dipengaruhi oleh kepercayaan animisme dan dinamisme yang disebut sipelebegu. Kemudian perkembangan selanjutnya budaya Mandailing bersinggungan dengan Hindu- Budha. Akan tetapi Islam membawa pengaruh yang sangat besar terhadap budaya Mandailing. Hal tersebut dibuktikan dengan adanya filosofi hombar do adat dohot ibadat yaitu adat tidak boleh bertentangan dengan agama. Dalihan Natolu merupakan konsep kekerabatan yang banyak mempengaruhi nilai-nilai kehidupan masyarakat Mandailing. Konsep Dalihan Natolu menjadi konsep dasar yang mempengaruhi pola permukiman adat Mandailing. Dalihan Natolu terdiri dari mora, anak boru, dan kahanggi. Hubungan antara ketiga komponen ini menentukan jarak antar rumah di permukiman adat. Suatu permukiman terdapat Rumah tinggal yang merupakan landmark dari berdirinya suatu permukiman. Rumah tinggal ini disebut Bagas Godang. Bagas Godang bagi masyarakat Mandailing bukan hanya sebagai rumah tinggal seorang raja atau tunggani huta. Godang bermakna sebagai rumah bagi seluruh marga di huta adat tersebut. Bagi masyarakat Mandailing raja tidak hanya berperan sebagai penguasa huta adat, akan tetapi mereka adalah orang yang dituakan yang dapat menyelesaikan berbagai masalah di permukiman adat tersebut. Komplek Bagas Godang terdiri dari Bagas Godang atau kediaman raja, Sopo Godang yaitu tempat peyimpanan instrument alat music dan musyawarah, serta biasanya memiliki Sopo Eme atau lumbung padi, serta Alaman Bolak Selangseutang merupakan halaman.
Keyword: Bagas Godang, taman vernakuler, desain taman, taman tradisional, rumah tinggal