Judul: Beach Ecotourism Development Studies in Manokwari of West Papua Province (Case Study Yen Beba Beach)
Abstrak: Manokwari merupakan kabupaten di Provinsi Papua Barat yang memiliki sumberdaya alam yang masih alami. Ekowisata merupakan suatu bentuk wisata yang sangat erat dengan prinsip konservasi. Konsep ekowisata merupakan alternatif pengembangan kawasan dengan memperhatikan kelestarian lingkungan., Manokwari is a district of West Papua Province that has unspoiled natural resources. Ecotourism is a form of tourism is very closely linked to the principle of conservation. The concept of ecotourism is an alternative development of the region that respect to environmental sustainability.
Keyword: Ecotourism, Yen Beba Beach, Manokwari

Judul: Potential and Development of Ecotourism at Pahiwi Wanukaka Beach, West Sumba
Abstrak: Pengembangan pantai menjadi ekowisata merupakan jasa lingkungan yang diberikan oleh kawasan pesisir. Pantai Pahiwi berpotensi menjadi destinasi wisata unggulan namun belum mendapatkan perhatian dari pemerintah setempat. Penelitian ini bertujuan menentukan kesesuaian ekologis dan merumuskan rencana pengembangan wisata Pantai Pahiwi yang berkelanjutan. Penelitian berlokasi di Pantai Pahiwi, Sumba Barat. Data yang dikumpulkan berupa potensi ekowisata, luas area yang dapat dimanfaatkan, keadaan umum lokasi, persepsi wisatawan dan masyarakat. Analisis yang dilakukan berupa analisis kesesuaian wisata (IKW), daya dukung kawasan (DDK), persepsi pengunjung, serta analisis SWOT. Kategori kesesuaian wisata pantai berada pada kategori sesuai dan sangat sesuai. Nilai DDK sebesar 774 orang/hari. Strategi pengembangan dapat dilakukan yaitu pemanfaatan secara optimal potensi sumberdaya alam dan lingkungan dalam pengembangan kegiatan dan atraksi wisata pantai, meningkatkan sosialisasi kepada masyarakat mengenai pemahaman dan kesadaran pentingnya pengembangan ekowisata, serta pengelola kawasan harus meningkatkan kerjasama dengan pihak pemerintah, swasta, dan masyarakat sekitar dengan program-program kerja yang disepakati.
Keyword: coastal ecotourism, tourism suitability index, visitor perceptions

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