Judul: Kajian Pengelolaan Hutan Rakyat Sengon (Paraserianthes falcataria (L) Nielsen): Kasus Desa Kesenet, Kecamatan Banjarmangu Kabupaten Banjarnegara
Abstrak: This research aims to study the management and cultivation of sengon community forest, to presume its potential, and also to calculate the contribution of sengon and other agroforestry plants toward the farmer’s total income in Kesenet Village, Banjarmagu District, Banjarnegara Residence of Central Java. The methods of the data collection used were quantitative and qualitative method. The quantitative method was used to measure the dimension of sengon and other agroforestry plants with sixty sampling plots in 0,1 hectare of circle shape which were determined by using purposive sampling with 3,10% sampling intensity. The qualitative method was used to analyze the forest management by interviewing through questionnaires to the sixty chosen farmers who own sampling plots and by studying literature. In general, the forest management in Kesenet Village applied the land preparation and management, seeding, planting, cultivation, harvesting and marketing. The stages of the management activities have not been completely achieved because of the traditional hereditary system which was still used. The potency of sengon per hectare in Kesenet Village was estimated on the average of 79,27 m3/ha or between 50,99 m3/ha to 107,55 m3/ha. The total area of sengon in Kesenet village was 193,86 ha and then the total wood of sengon was achieved 15.368,24 m3 or between 9.863,66 m3 to 20.872,83 m3. The income contribution of sengon 4,37% and 84,68 % of salak pondoh of total income forest farmer was illustrated that the sengon cultivation still becomes a secondary business for Kesenet villagers. The efforts that should be done to develop the management of sengon community forest are both by intensifying counseling and training the sengon management technique gradually. Besides that, the market information in warranting the stability of a certain cost can make the farmers easier in bargaining position. The countermeasure of the insects, pests, and karat puru disease which have been attacking 80% sengon plants up until now needs to get a serious attention, especially to warrant the developmental continuation of society business in community forest of sengon.
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Judul: Sistem pengelolaan hutan rakyat jenis sengon [Paraserianthes falcataria (L) Nielsen] di Desa Burat, Kecamatan Kepil, Kabupaten Wonosobo, Provinsi Jawa Tengah
Abstrak: Hutan merupakan sumberdaya alam yang dalam penggunaannya dapat dipulihkan kembali (renewable). Pemanfaatan dan pengelolaan hutan bertujuan untuk meningkatkan kesejahteraan masyarakat tanpa mengabaikan aspek kelestariannya. Dalam prakteknya di lapangan masih didapatkan beberapa hal yang dirasa kurang maksimal dalam pengelolaan hutan, khususnya hutan rakyat. Karena pengelolaannya masih sederhana dan sangat bervariasi berdasarkan letak geografis dan perlakuan dari pemilik lahan. Dengan adanya beberapa cara pengembangan hutan rakyat dan dengan lebih intensifnya pengelolaan dengan cara yang lebih sustainable dengan daya dukung potensi sumberdaya hutan rakyat, kinerja pengusahaan, dinamika lingkungan dan faktor-faktor lainnya diharapkan hutan rakyat dapat menjadi suatu unit bisnis startegis yang mampu mempertahankan keberlangsungan produksi dan pengusahaanya dengan tetap memprioritaskan kelestarian hutannya. Tujuan utama dari penelitian ini, adalah untuk mempelajari sistem pengelolaan hutan rakyat dan menyusun rencana pengaturan kelestarian produksi hutan rakyat sengon di Desa Burat, Kecamatan Kepil, Kabupaten Wonosobo, Propinsi Jawa Tengah. Sumber data yang digunakan adalah data primer dan data sekunder. Data primer diperoleh dari wawancara kepada responden yang menangani produsen, pedagang, pengrajin industri dan industri pengolahan kayu. Data sekunder diperoleh dari Dinas Kehutanan Kabupaten Wonosobo, Kantor Kecamatan Kepil, Kantor Desa Burat dan browsing internet. Metode analisis yang digunakan adalah analisis kualitatif untuk data sekunder melalui hasil wawancara berdasarkan hasil kuisioner dan analisis kuantitatif untuk data primer yang berupa data potensi jenis sengon melalui pendugaan berdasarkan teknik sampling sederhana. Sistem pengelolaan hutan rakyat di Desa Burat sifatnya masih sederhana, dalam hal ini dapat dibuktikan dari tahapan kegiatan pengelolaannya seperti penanaman, pemeliharaan, pemanenan serta pemasaran masih belum mengikuti pola yang sama. Hal ini disebabkan karena sistem informasi manajemen belum efektif untuk dapat diterima oleh masyarakat petani hutan Desa Burat. Faktor-faktor penunjang dalam pengelolaan hutan rakyat seperti sarana dan prasarana masih belum merata. Sistem kelembagaan serta kebijakan yang ada belum mendukung sepenuhnya kegiatan usaha pengembangan di bidang hutan rakyat sengon di Desa Burat.
Keyword: Forest, Forest people, The concept of sustainability, Peoples forest management system, Sustainable

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