Judul: Pengelolaan Ekowisata Mangrove Pandansari di Desa Kaliwlingi, Brebes, Jawa Tengah
Abstrak: Ekosistem mangrove Pandansari diketahui mempunyai potensi yang sudah dikembangkan sebagai objek dan daya tarik ekowisata, tetapi belum dikelola dan dimanfaatkan secara optimal. Permintaan pengunjung yang datang ke lokasi ekowisata mangrove Pandansari terus meningkat dari waktu ke waktu. Pencapaian keuntungan ekonomi harus diupayakan agar tidak menghambat rehabilitasi yang dilakukan. Penelitian ini dilakukan dengan tujuan mengkaji daya dukung kawasan serta merumuskan rencana pengelolaan ekowisata mangrove Pandansari. Penelitian dilakukan pada tanggal 20 Januari 2019 – 5 Februari 2019. Analisis yang digunakan yaitu Daya Dukung Kawasan. Daya dukung existing dapat menampung jumlah pengunjung sebesar 629 orang/hari dan rata-rata jumlah pengunjung di tahun 2018 sebesar 800 orang/hari. Sedangkan daya dukung planning ekowisata mangrove Pandansari dapat menampung pengunjung sebanyak 295 orang/hari. Daya dukung total pada area mangrove Pandansari menunjukkan nilai sebesar 924 orang/hari.
Keyword: Daya dukung, ekowisata, mangrove, Pandansari

Judul: Social-Ecological System (SES) Connectivity in Padansari Mangrove Ecosystem, Kaliwlingi Village, Brebes Regency, Central Java Province
Abstrak: Abrasi yang terjadi pada tahun 2000-2008 di pesisir Desa Kaliwlingi, Kabupaten Brebes mengakibatkan hilangnya luas mangrove sejauh 7 km dengan luas 186 ha, hal tersebut disebabkan oleh konversi dan degradasi pada ekosistem mangrove. Ekosistem mangrove memiliki empat jasa layangan lingkungan, salah satunya adalah pendukung. Ekosistem mangrove Pandansari telah dikembangkan menjadi ekowisata Dewi Mangrove Sari yang bertujuan untuk mempromosikan kesadaran lingkungan dan edukasi wisata. Interaksi antara sistem ekologi dan sosial dapat menciptakan perubahan sosial dan ekologi bersamaan. Penelitian ini bertujuan untuk menganalisis keterkaitan Social-Ecological System pada ekosistem mangrove Pandansari agar dapat mengembangkan strategi pengelolaan yang berkelanjutan. Pengambilan data dilakukan pada bulan November 2023 di ekosistem mangrove Pandansari. Metode yang digunakan yaitu participatory mapping dan participatory data collection yang dilakukan dengan cara observasi lapangan dan wawancara mendalam dengan responden. Hasil menunjukkan bahwa ekosistem mangrove Pandansari (RS) tergolong dalam kategori padat dengan biota (RU) yang hidup cukup beragam. Keberadaan pengguna sumberdaya (RA) sangat berpengaruh terhadap semua kegiatan yang ada pada ekosistem mangrove Pandansari, sehingga memunculkan aturan-aturan yang sudah ditetapkan (RG). Konektivitas SES yang terjadi di mangrove Pandansari, menunjukan keterkaitan yang erat antar resources system (RS) dengan resources actor (RA) dengan banyaknya dampak yang diberikan oleh resources actor (RA)., Abrasion that occurred in 2000-2008 on the coast of Kaliwlingi Village, Brebes Regency resulted in the loss of 7 km of mangrove area with an area of 186 ha, this was caused by conversion and degradation of the mangrove forest ecosystem. The mangrove ecosystem has four environmental services, one of which is support. The Pandansari mangrove forest has been developed into the Dewi Mangrove Sari ecotourism which aims to promote environmental awareness and tourism education. Interactions between ecological and social systems can create concurrent social and ecological change. This research aims to analyze the relationship between the Social Ecological System in the Pandansari mangrove ecosystem in order to develop sustainable management strategies. Data collection was carried out in November 2023 in the Pandansari mangrove ecosystem. The methods used were participatory mapping and participatory data collection which was carried out by means of field observations and in-depth interviews with respondents. The results show that the Pandansari (RS) mangrove ecosystem is classified in the dense category with quite diverse living biota (RU). The existence of resource users (RA) greatly influences all activities in the Pandansari mangrove ecosystem, giving rise to established regulations (RG). The SES connectivity that occurs in the Pandansari mangrove shows a close relationship between the Resource System (RS) and Resource Actors (RA) with many impacts provided by Resource Actors (RA).
Keyword: social-ecological system, mangrove, konektivitas, jasa ekosistem

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