Judul: Upaya Rehabilitasi Mangrove dalam Rangka Pengembangan Ekowisata di Pantai Pejarakan, Bali
Abstrak: Pantai Pejarakan memiliki ekosistem mangrove yang luas, hasil penelitian sebelumnya menunjukkan daerah ini sesuai untuk dikembangkan menjadi destinasi ekowisata. Penelitian ini dilakukan dengan tujuan menyusun rencana aksi pengembangan kawasan rehabilitasi guna menjadikan pantai Pejarakan sebagai lokasi ekowisata. Lokasi penelitian berada di kawasan mangrove pantai Pejarakan, Buleleng, Bali. Data yang diambil berupa data kesehatan mangrove, kualitas lingkungan serta persepsi masyarakat tentang konservasi dan ekowisata mangrove. Berdasarkan hasil evaluasi dan matriks rehabilitasi didapatkan rencana aksi yang berbeda untuk tiap kategori. Hasil evaluasi terhadap upaya rehabilitasi yang telah dilakukan sebelumnya menunjukkan Rhizophora mucronata dan Rhizophora apiculata menjadi jenis yang paling sesuai dengan teknik penanaman rumpun berjarak. Rencana tapak yang diusulkan disesuaikan dengan studi kesesuaian ekowisata mangrove sebelumnya.
Keyword: mangrove, rehabilitasi, lingkungan, Pejarakan

Judul: Potential of Mangrove Resources for Ecotourism Development in Pejarakan Village, Buleleng Regency, Bali
Abstrak: Potensi ekosistem mangrove yang berada di Desa Pejarakan, Kabupaten Buleleng tergolong cukup tinggi untuk dijadikan ekowisata, hal ini didukung oleh keanekaragaman jenis mangrove yang beragam, potensi biota yang tinggi, dan objek pemandangan yang indah. Penelitian ini bertujuan untuk menganalisis potensi sumberdaya mangrove untuk pemanfaatan ekowisata serta merumuskan strategi pengelolaan ekowisata mangrove di Desa Pejarakan, Kabupaten Buleleng, Bali. Penelitian ini berlokasi di ekosistem mangrove PT Agung Menjangan Mas, Tambak Pejarakan BBRBLPP, Desa Pejarakan. Data yang diambil berupa data parameter kesesuaian wisata mangrove, parameter lingkungan, dan parameter sosial ekonomi. Analisis yang dilakukan berupa analisis kesesuaian wisata (IKW), daya dukung kawasan, willingness to pay, persepsi masyarakat, serta analisis SWOT. Hasil penelitian yang didapat sesuai untuk dikembangkan menjadi ekowisata dengan nilai IKW kategori sesuai pada dua titik dan sangat sesuai pada satu titik. Nilai DDK sebesar 234 orang pengunjung per hari dengan panjang lintasan tracking mangrove sepanjang 1.461 meter. Analisis WTP yang didapat untuk tiket masuk sebesar Rp. 15.833, strategi pengembangan yang dapat dilakukan adalah strategi agresif, dan memiliki tiga prioritas strategi utama., The potential of mangrove ecosystems in Pejarakan Village, Buleleng Regency, is quite high to be used as ecotourism; this is supported by the diversity of diverse mangrove species, high biota potential, and beautiful scenic objects. This study aims to analyze the potential of mangrove resources for ecotourism utilization and formulate a mangrove ecotourism management strategy in Pejarakan Village, Buleleng Regency, Bali. This research is in the mangrove ecosystem of PT Agung Menjangan Mas, BBRBLPP Teaching Pond, and Pejarakan Village. The data taken is in the form of data on mangrove tourism suitability parameters, environmental parameters, and socioeconomic parameters. The analysis carried out is in the form of tourism suitability analysis (IKW), regional carrying capacity, willingness to pay, community perception, and SWOT analysis. The results of the research obtained are suitable to be developed into ecotourism, with the IKW value of the category at two points and very appropriate at one point. The DDK value is 234 visitors per day with a mangrove tracking track length of 1.461 meters. According to the WTP analysis obtained for entrance tickets of Rp. 15.833, the development strategy that can be done is aggressive and has three main strategic priorities.
Keyword: Mangrove ecosystem, Tourism suitability index, Willingness to pay

Judul: Algorithm construction of HLI hash function
Abstrak: Cryptography is a study of mathematical techniques related to aspects of information security regarding on confidentiality, data integrity, entity authentication, and data origin authentication. Data integrity is a service, which is associated with the conversion of data carried out by unauthorized parties. To maintain data integrity, one can use hash functions. An hash function is a computationally efficient function to map an arbitrary length bitstring to a fixed length bitstring called as hash value. The use of hash function in maintaining the information integrity and authentication is in digital signatures, virus protection, and software distribution. Illustration of the hash function in the integrity and authentication of information that is emailed as follow. The sender sends the information and hash value to the recipient. If the hash value of the information is equal to the hash value that is sent by the sender, then information has not been changed. Otherwise the information has been changed. An hash function has two properties, one way and collision resistance. An hash function is called one way if it is computationally infeasible to find any input such that when given any hash value . Meanwhile an hash function is called collision resistant if it is computationally infeasible to find any two inputs where such that . The purpose of this study is to construct a HLI hash function algorithm, to analyze the speed and security of the hash functions as a results of construction. Furthermore, it is to compare it with SWIFFT. Hash function is constructed based on the result of algebraic operations on modular polynomial ringwith . Modular polynomial ring noted as is a set of all polynomials of degree at most with coefficients in . can be represented as a set of integer vector of modulo in dimension . So, it is simple to implement in a computer. In vector operations, is lattice . Furthermore, alattice that is defined from certain polynomial ring is called ideal lattice. HLI hash function is consists of addition and multiplication algorithm in the ring. Addition algorithm consists of sumation operations of modulo and multiplication consists of multiplication operations of modulo . Generally, algorithm of HLI hash function consists of multiplication operations of modulo and addition operations of modulo . However, if the input is binary number then multiplication algorithm only consists of multiplication operation of modulo , so algorithm of HLI hash function consists of multiplication operations of modulo and addtion operations of modulo . An hash function is secured if it has two properties, i.e., one way and collision resistance. HLI hash function hash is one way, it is following the proof of Micciancio. It is has collision resistant because of polynomial is irreducible over and monic. Moreover, it is proved that for every unit vector , the vector is small vector. If the input of hash function is a binary number then HLI hash function only involves addition operations of modulo . So the time that used almost same with SWIFFT. The excellence of HLI hash function is the key size smaller than SWIFFT. This effect on
Keyword: hash function, modular polynomial ring, lattice