Judul: suatu studi Tentang Alat-Alat Penangkap Nener dan hasil Tangkapannya di Perairan Situbondo, Tuban dan Sumenep
Abstrak: Tujuan penelitian ini adalah untuk mempelajari deskripsi alat-alat penangkap nener, metode pengoperasiannya, menghitung produktivitas seser serta padat penyebaran nener. Dilakukan di Perairan Situbondo, Tuban dan Sumenep, mulai bulan September sampai Olctober 1984. Untuk mencapai tujuan penelitian, dipakai metode kasus dan metode survei. Metode kasus dimaksudkan untuk mempelajari deskripsi alat-alat penangkap nener, sedangkan metode survei dilakukan untuk mengetahui produktivitas seser dan padat penyebaran nener selama penelitian.
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Judul: Uji coba pengoperasian Set Net di Perairan Citeureup, Kabupaten Pandeglang
Abstrak: Set net adalah suatu jenis alat tangkap yang dipasang (di set) di suatu fishing ground yang banyak dilalui oleh macam-macam gerombolan ikan dalam jangka waktu yang relatif lama atau pemasangannya disesuaikan dengan lama musim ikan yang bermigrasi ke tempat dimana alat tangkap tersebut dipasang. Sampai saat ini set net belum berkembang di Indonesia. Tujuan penelitian ini adalah untuk mengkaji rancang bangun pemasangan dan pengoperasian set net sebagai dasar untuk pengembangan di Indonesia dan melihat komposisi hasil tangkapan set net. Pada penelitian ini alat tangkap yang diujicobakan adalah satu unit set net. Metode yang digunakan dalam penelitian ini adalah eksperimental fishing yaitu suatu uji coba set net di lapangan. Data primer didapatkan dengan melakukan pengamatan langsung ke objek penelitian yang meliputi rancang bangun set net, cara pemasangan set net dan pengoperasian set net. Dalam penelitian ini juga digunakan data sekunder untuk melihat keadaan umum lokasi penelitian. ..dst
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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