Judul: Pola Penyebaran dan Regenerasi Jenis Saninten (Castanopsis argentea Blume) di Resort Selabintana, Taman Nasional Gunung Gede Pangrango
Abstrak: Saninten (Castanopsis argentea Blume) merupakan salah satu jenis pohon asli di Taman Nasional Gunung Gede Pangrango terutama pada Resort Selbintana. Saninten memiliki buah yang bisa dikonsumsi dan juga dimanfaatkan sebagai bahan bangunan. Sehubungan dengan manfaat tersebut pohon ini perlu dibudidayakan, sedangkan penelitian mengenai ekologi dan populasi saninten di alam belum banyak dilakukan. Untuk keperluan ini perlu informasi mengenai penyebaran alami saninten demi keperluan pengembangannya. Tujuan penelitian ini adalah mengkaji potensi dan pola penyebaran jenis saninten (Castanopsis argentea Blume) serta regenerasinya. Penelitian ini dengan metode kombinasi antara jalur dan garis berpetak dengan memotong kontur. Hasil penelitian menunjukkan pola penyebaran saninten pada kedua lokasi penelitia adalah mengelompok (clump). Hasil indeks morishita pada Lokasi 1 dan Lokasi 2 berturut-turut sebesar 1.68 dan 1.29. Potensi saninten semai jumlah saninten lebih banyak ditemukan pada Lokasi 1 yaitu dengan kerapatan semai 1200 ind/ha.
Keyword: C.argentea, pola penyebaran, Resort Selabintana, Taman Nasional Gunung Gede Pangrango

Judul: Distbution of Saninten (Castanopsis argentea Blume) in Kawah Ratu Resort, Gunung Halimun Salak National Park, West Java
Abstrak: Saninten (Castanopsis argentea Blume) adalah salah satu jenis asli di Taman Nasional Gunung Halimun Salak terutama pada Resort Kawah Ratu. Saninten termasuk kedalam famili Fagaceae yang merupakan jenisserbaguna. Buah saninten dapat dikonsumsi serta kayu saninten dimanfaatkan sebagai bahan bangunan. Penelitian ini bertujuan untuk menganalisis kerapatan dan pola penyebaran jenis saninten (Castanopsis argentea Blume) di Resort Kawah Ratu, Taman Nasional Gunung Halimun Salak. Terdapat dua lokasi pengambilan data yaitu pada blok Pamengpeuk dan blok Leles di Resort Kawah Ratu TNGHS dengan menggunakan metode petak tunggal. Hasil penelitian menunjukkan pola penyebaran saninten pada blok Pamengpeuk adalah mengelompok, sedangkan pada blok Leles tidak diketahui, hal tersebut dikarenakan hanya ditemukannya 1 individu saninten pada blok Leles.
Keyword: Castanopsis argentea Blume, Penyebaran, Resort kawah ratu, saninten, taman nasional gunung halimun salak, Castanopsis argentea Blume, Distribution, Gunung Halimun Salak National Park, Kawah Ratu Resort, Saninten

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