Judul: Estimation of Economic Value of Carbon Sequestration and Sustainable Peatland Management Strategy in Kedaton Village Kayu Agung District
Abstrak: Ekosistem gambut di Kelurahan Kedaton terdegradasi akibat penggundulan hutan, drainase buatan, kebakaran hutan dan lahan, dan konversi lahan ke pertanian dan perkebunan. Tujuan penelitian ini adalah (1) mengidentifikasi kondisi pengelolaan lahan gambut Kelurahan Kedaton, (2) mengestimasi carbon stock dan nilai ekonomi serapan karbon di lahan gambut Kelurahan Kedaton, (3) menganalisis strategi pengelolaan lahan gambut berkelanjutan Kelurahan Kedaton. Metode yang digunakan dalam penelitian ini adalah deskriptif kualitatif, persamaan allometrik, dan Analytical Hierarchy Process. Hasil penelitian menunjukkan bahwa: (1) pengelolaan Kebun Plasma Nutfah belum berjalan aktif karena kontrak kerja sama telah berakhir, dan pengelolaan lahan gambut administratif Kelurahan Kedaton belum dilakukan secara kolaboratif, (2) nilai ekonomi serapan karbon total adalah sebesar Rp 398.561.553.448 (3) program pengelolaan lahan gambut berkelanjutan di Kelurahan Kedaton yang menjadi prioritas diantaranya promosi pengetahuan dan kelembagaan tradisional di kalangan generasi muda; inisiasi forum komunikasi para pihak untuk pengelolaan dan pemanfaatan lahan gambut; RPJM/RKP kelurahan memasukkan nilai pelestarian lahan gambut; dan pengembangan rencana bisnis pengelolaan lahan gambut., Peat ecosystems in peat ecosystems in Kedaton Village are degraded due to deforestation, artificial drainage, forest and land fires, and land conversion to agriculture and plantations. The objectives of this research are (1) to identify the condition of peatland management in Kedaton Village, (2) to estimate the biomass content and carbon stock as well as the economic value of carbon sequestration in Kedaton Village peatlands, (3) to analyze sustainable peatland management strategies in Kedaton Village. The methods used in this research are descriptive qualitative, allometric equation, and Analytical Hierarchy Process. The results showed that: (1) the management of the Kebun Plasma Nutfah has not been active because the cooperation contract has ended, and the administrative peatland management of Kedaton Village has not been carried out collaboratively, (2) the economic value of total carbon sequestration is Rp 398.561.553.448 (3) priority sustainable peatland management programs in Kedaton Village include the promotion of traditional knowledge and institutions among the younger generation; initiation of a communication forum for peatland management and utilization; RPJM/RKP of the village includes the value of peatland conservation; and development of a peatland management business plan.
Keyword: restoration

Judul: Economic Value Estimation and Management Strategy of Community Forests (Case Study: Megamendung Organic Forest, Bogor)
Abstrak: Jumlah penduduk Indonesia yang selalu mengalami peningkatan setiap tahunnya menyebabkan kebutuhan akan lahan turut meningkat, sehingga berpotensi terjadinya alih fungsi lahan. Perubahan fungsi lahan dari pertanian ke non pertanian akan berdampak pada menurunnya kualitas lingkungan dan mengakibatkan terjadinya lahan kritis. Salah satu upaya yang dapat dilakukan untuk merehabilitasi lahan kritis adalah dengan melakukan rehabilitasi hutan dan lahan (RHL). Salah satu hasil dari RHL yang berada di Kabupaten Bogor, Jawa Barat adalah Hutan Organik Megamendung. Keberadaan hutan organik memberikan banyak manfaat, di antaranya sebagai tempat penyerapan karbon, daerah resapan air, hingga sumber keanekaragaman hayati. Berdasarkan hal tersebut tujuan dari penelitian ini, yaitu (1) mengestimasi nilai guna ekonomi dari Hutan Organik Megamendung; (2) mengestimasi nilai non-guna ekonomi dari Hutan Organik Megamendung; (3) merumuskan alternatif strategi pengelolaan Hutan Organik Megamendung yang berkelanjutan. Metode yang digunakan dalam penelitian ini adalah pendekatan harga pasar, benefit transfer, dan PROMETHEE. Hasil penelitian menunjukkan, (1) nilai guna Hutan Organik Megamendung sebesar Rp1.589.532.870 per tahun; (2) nilai non-guna Hutan Organik Megamendung sebesar Rp8.845.125 per tahun; dan (3) alternatif pengelolaan yang dapat diprioritaskan adalah pengoptimalisasian lahan dengan sistem agroforestri., Indonesia's growing population is driving a need for more land, leading to potential land conversion from agricultural to non-agricultural uses. The change in land use will have significant environmental implications, including a potential decrease in environmental quality and the occurrence of critical land. Efforts can be made to rehabilitate critical land through conducting forest and land rehabilitation (RHL). One of the results of RHL in Bogor Regency, West Java is the Megamendung Organic Forest. The existence of this organic forest certainly has many benefits, including carbon sequestration, water catchment areas, and a source of biodiversity. The objectives of this study are to (1) estimate the use value of the Megamendung Organic Forest; (2) estimate the non-use value of the Megamendung Organic Forest; and (3) formulate alternative strategies for sustainable management of the Megamendung Organic Forest. The methods used in this research are market price, benefit transfer, and PROMETHEE. The results showed, (1) the use value of Megamendung Organic Forest is IDR 1.589.532.870 per year; (2) the non-use value of Megamendung Organic Forest is IDR 8.845.125 per year; and (3) alternative management that can be prioritized is land optimization with an agroforestry system.
Keyword: alternative strategies, critical land, market price, PROMETHEE

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