Judul: Evalusai Pengembangan Ekowisata Mangrove: Studi kasus di Bedul, Resort Grajagan, Taman Nasional Alas Purwo, Banyuwangi, Jawa Timur
Abstrak: Mangrove forest is a very unique tropical forest ecosystem. Alas Purwo National Park (APNP) prossesses some natural mangrove forest. The development of mangrove acotourism in APNP has accoured before 2007 by APNP and Desa Sumbersari. However, it is not easy to establish ecotourism which contibutes to the satisfication of the visitors, well-being of the local people and ecological sustainability. It is worrying when the term "ecotourism' is just used for marketing of certain tourism products with a lack of stakeholder' understanding of ecotourism principlea. Therefore, evaluating mangrove ecotourism development in APNP should beconducted. Tehe objectives of this research are to identify mangrove ecotourism potentials at APNP, evaluate the curent tourism activity at Bedul APNP and its development into mangrove ecotourism by cross checkingh it to principles of ecotourism, and finally, arrange recommendation to APNP regarding mangrove ecotourism implementation.
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Judul: Pengembangan Ekowisata Mangrove Blok Bedul, Resort Grajagan, Taman Nasional Alas Purwo, Provinsi Jawa Timur
Abstrak: Taman Nasional Alas Purwo (TNAP) merupakan kawasan pelestarian dengan formasi vegetasi yang lengkap, salah satu formasinya adalah formasi hutan mangrove yang terletak di mangrove Blok Bedul yang potensial untuk dikembangkan sebagai objek wisata. Penelitian ini bertujuan untuk menyusun strategi pengembangan wisata dengan tahapan identifikasi potensi objek wisata, identifikasi pengelolaan wisata, menentukan motivasi, persepsi, serta preferensi pengunjung, dan menyusun strategi pengembangan wisata. Metode yang digunakan adalah studi literatur, observasi lapang, kuesioner, dan wawancara. Data dianalisis menggunakan skala Likert untuk penilaian motivasi, persepsi, dan preferensi pengunjung, dan strategi pengembangan wisata dianalisis menggunakan SWOT. Hasil penelitian mendapatkan 20 jenis tumbuhan, 5 jenis mamalia, 15 jenis burung air, 1 jenis reptil, 16 jenis pisces, 5 jenis molusca, dan 7 jenis crustaceae. Potensi sosial dan budaya masyarakat setempat adalah kearifan lokal masyarakat dalam mencari ikan, kerang, udang, dan jenis lainnya, serta upacara adat tahunan Petik Laut. Pengelolaan wisata dikelola oleh Balai TNAP, badan pengelola wisata mangrove, dan pemerintah daerah. Kepentingan TNAP sejalan dengan kepentingan desa yaitu, meningkatkan kesejahteraan masyarakatnya tanpa menebang atau mencari kayu di hutan. Motivasi pengunjung tertinggi (4,27) adalah untuk menghilangkan lelah (refreshing), persepsi tertinggi (3,64) pada keadaan di lokasi, dan preferensi tertinggi (4,21) untuk berjelajah dan menikmati keindahan mangrove.
Keyword: mangrove Blok Bedul, pengembangan ekowisata, Taman Nasional Alas Purwo

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