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 Hutan Mangrove Teluk Pangpang, Taman Nasional Alas Purwo.
Abstrak: Taman Nasional Alas Purwo (TNAP) memiliki beberapa areal mangrove, salah satunya adalah hutan mangrove Teluk Pangpang Resort Kucur. Hutan mangrove dapat dijadikan sebagai objek ekowisata. Ekowisata mangrove dapat dikembangkan berdasarkan ekologi dan daya dukung kawasannya. Pentingnya pengembangan ekowisata mangrove agar semua sumberdaya yang ada dapat dimanfaatkan dengan maksimal tanpa merusak sumberdaya. Tujuan dari penelitian ini adalah mengidentifikasi sumberdaya alam yang dapat dijadikan potensi ekowisata, pengelolaan ekowisata, motivasi, persepsi dan preferensi pengunjung, serta menyusun rekomendasi pengembangan. Penelitian ini dilakukan di hutan mangrove Teluk Pangpang TNAP dan Desa Kedungasri pada bulan Maret – April 2020. Pengambilan data dilakukan dengan cara menyebar kuesioner, wawancara, observasi lapang, studi pustaka. Sumberdaya mangrove yang dapat dikembangkan menjadi objek ekowisata berdasarakan aspek fauna, flora dan sosial budaya adalah Egretta garzetta, Pavo muticus, Sonneratia alba berukuran besar, bentang alam mangrove, jenis-jenis kerang, ikan belanak serta budaya Takir sewu dan kerajinan layang-layang. Pengelolaan ekowisata hutan mangrove Teluk Pangpang TNAP hanya dilakukan oleh TNAP saja tanpa melibatkan pihak lain diluar kawasan TNAP. Motivasi pengunjung untuk datang ke ekowisata paling besar adalah untuk memperluas wawasan, persepsi paling besar terhadap fasilitas adalah tempat informasi dan terhdap pengelola paling besar perencanaan objek wisata, untuk preferensi yang dipilih oleh pengunjung adalah mengambil gambar, menyaksikan tarian daerah dan menikmati kuliner laut. Strategi pengembangan yang dilakukan adalah strategi SO (Strength - Opportunity) dengan pemberdayaan masyarakat dalam menjalankan kegiatan ekowisata dan juga menambahkan objek ekowisata berdasarkan minat pengunjung.
Keyword: ekowisata, hutan mangrove Teluk Pangpang, 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