Judul: Kesesuaian Jasa Ekosistem Kultural untuk Kawasan Mangrove di iiDesa Tanjung, Kabupaten Sumenep, Jawa Timur
Abstrak: Pemanfaatan jasa ekosistem kultural yang meliputi wisata berkelanjutan dapat mendukung kemajuan sosial dan ekonomi masyarakat lokal tanpa merusak bentang alam yang ada di Desa Tanjung, Kabupaten Sumenep, Jawa Timur, Penelitian ini bertujuan menentukan kesesuaian kawasan mangrove di Desa Tanjung sebagai objek nature-based tourism, mengidentifikasi kategori Recreational Opportunity Spectrum (ROS) kawasan mangrove, dan menguraikan pandangan sosial masyarakat dan pokmaswas juga preferensi wisatawan terhadap kegiatan wisata mangrove berkelanjutan di Desa Tanjung. Penelitian ini dilaksanakan selama bulan Juli 2022 di kawasan mangrove Desa Tanjung. Data ekosistem mangrove diperoleh dari pengambilan contoh secara langsung di lapangan dengan metode transek kuadrat. Data sosial diperoleh dari wawancara kepada wisatawan, masyarakat, dan anggota pokmaswas. Hasil penelitian menunjukkan bahwa berdasarkan analisis Indeks Kesesuaian Wisata (IKW), kawasan mangrove tidak sesuai dijadikan sebagai kawasan wisata berkelanjutan walaupun masyarakat dan pokmaswas memberikan dukungan. Kawasan mangrove termasuk roaded natural dan rural dalam kategori ROS. Keselarasan pandangan masyarakat dan pokmaswas krusial untuk keberlangsungan pengelolaan ekosistem mangrove. Preferensi wisatawan penting untuk diketahui dan dipertimbangkan dalam pengembangan wisata mangrove berkelanjutan. Wisata mangrove berkelanjutan selayaknya dilakukan setelah kondisi ekosistem mangrove dan kompetensi SDM (Sumber Daya Manusia) lokal Desa Tanjung memadai., Utilizing cultural ecosystem services includes sustainable tourism, can support the social and economic progress of local communities without harming the natural landscape in Tanjung Village, Sumenep Regency, East Java. This research aims to determine the suitability of the mangrove area in Tanjung Village as a nature-based tourist attraction, identify Recreational Opportunity Spectrum (ROS) categories of the mangrove area, and describe the social views of the community and community groups as well as tourist preferences for sustainable mangrove tourism activities in Tanjung Village. This research was carried out during the month of July 2022 in the mangrove area of Tanjung Village. Mangrove ecosystem data was obtained from direct sampling in the field using the quadrat transect method. Social data was obtained from interviews with tourists, locals, and members of the community watchdog group (Pokmaswas). The research results show that based on the Tourism Suitability Index (IKW) analysis, the mangrove area is not suitable for a sustainable tourism area even though the community and community groups provide support. Mangrove areas are categorized as roadednatural and rural in the ROS category. The alignment of views of the locals and Pokmaswas is crucial for the continued preservation of the mangrove ecosystem. Tourist preferences are important to know and consider in developing sustainable mangrove tourism. Sustainable mangrove tourism should be carried out after the condition of the mangrove ecosystem and the competence of local human resources in Tanjung Village are adequate.
Keyword: wisata berkelanjutan, mangrove ecosystem, environmental services, sustainable tourism

Judul: Strategi Wisata Mangrove berbasis Konservasi di Desa Jagojago, Kabupaten Tapanuli Tengah, Provinsi Sumatera Utara.
Abstrak: Potensi sumber daya mangrove di Indonesia yang mencakup sekitar 23% dari total luas mangrove dunia, memberikan manfaat langsung dan tidak langsung bagi manusia dan lingkungan. Meskipun demikian, beberapa daerah, seperti Desa Jagojago di Sumatera Utara, mengalami deforestasi dan degradasi mangrove akibat kegiatan tambak udang dan alih fungsi lahan menjadi pemukiman. Tindakan tidak berkelanjutan ini telah membuat ekosistem mangrove di Desa Jagojago mengalami penurunan luas yang dapat mengurangi manfaatnya. Oleh karena itu, perlu untuk menjaga keberlanjutan ekosistem mangrove sesuai dengan prinsip-prinsip konservasi. Hal ini untuk mencapai keseimbangan antara pelestarian ekosistem mangrove dan pemanfaatan berkelanjutan. Salah satu pengembangan yang berkelanjutan dan merupakan bentuk upaya konservasi adalah pendekatan ekowisata. Dalam pengembangan ekowisata, perlu memenuhi beberapa persyaratan sumber daya mangrove, sehingga penelitian ini memiliki tujuan menganalisis kesesuaian dan ketidaksesuaian ekosistem mangrove, menghitung daya dukung kawasan dan daya dukung riil, dan menilai persepsi masyarakat untuk merumuskan strategi pengembangan ekowisata mangrove di Desa Jagojago, Kabupaten Tapanuli Tengah, Provinsi Sumatera Utara. Metode penelitian mencakup pendekatan spasial dan survei dengan penggunaan data primer dan sekunder. Analisis data melibatkan penilaian kerapatan mangrove, kesesuaian wisata, daya dukung kawasan, daya dukung riil, persepsi masyarakat, dan Analytic Network Process (ANP) untuk memperoleh prioritas dalam identifikasi permasalahan dan solusi dalam pengelolaan ekosistem mangrove. Hasil penelitian menunjukkan bahwa ekosistem mangrove Desa Jagojago mempunyai potensi wisata mangrove yang tidak terlalu besar, dengan luas area yang sangat sesuai 0,91 ha, area sesuai 7,59 ha, dan area tidak sesuai 7,55 ha. Kawasan ini memiliki daya dukung 177 orang per hari atau 37.471 orang per tahun. Persepsi masyarakat terhadap pengembangan wisata mangrove mencapai tingkat persetujuan 75,39%, menandakan tingginya dukungan dari masyarakat terhadap upaya tersebut. Strategi pengelolaan wisata mangrove di Desa Jagojago berdasarkan prioritas solusi mencakup pelibatan masyarakat langsung dalam pengembangan, peningkatan kerja sama antara pemerintah daerah dan lembaga terkait, perlu usaha rehabilitasi mangrove, dan peningkatan pendapatan.
Keyword: Daya dukung, Ekowisata, Jagojago, Kesesuaian, Mangrove

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