Judul: Kajian Stok Sumberdaya Ikan Tembang (Sardinella fimbriata Valenciennes, 1847) di Perairan Teluk Banten yang Didaratkan di PPN Karangantu, Banten
Abstrak: Sardinella fimbriata atau fringescale sardine atau ikan tembang menjadi salah satu sumberdaya ikan yang dimanfaatkan. Hasil tangkapan ikan tembang di PPN Karangantu, Banten menurun dari tahun ke tahun. Oleh karena itu diduga ikan tembang di perairan Teluk Banten telah mengalami eksploitasi berlebih. Tujuan penelitian ini adalah untuk mengetahui status ikan tembang melalui beberapa parameter dinamika populasi ikan agar dapat dijadikan pertimbangan dalam pengelolaan sumberdaya ikan tembang. Pola pertumbuhan ikan tembang di Teluk Banten bersifat allometrik positif. Hasil pemisahan kelompok umur menggunakan metode NORMSEP menunjukkan ikan tembang terdiri dari dua kelompok umur dengan L∞189.0675 mm untuk ikan betina dan 191.6537 mm untuk ikan jantan. Laju eksploitasi (E) mengindikasikan bahwa sumberdaya ikan tembang telah mengalami eksploitasi berlebih. Dugaan pertama kali ikan tembang matang gonad adalah 161 mm. Informasi ini dapat di jadikan dasar alternatif pengelolaan yakni pengaturan penangkapan yang ukurannya lebih dari 161 mm agar ikan-ikan tersebut dapat memijah setidaknya satu kali agar lestari dan berkelanjutan.
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Judul: Analisis Sumber Daya Ikan Tembang (Sardinella fimbriata) yang Didaratkan di PPN Karangantu, Provinsi Banten
Abstrak: Ikan tembang menjadi salah satu sumber daya ikan di PPN Karangantu yang bernilai ekonomis penting. Penelitian ini bertujuan untuk men getahui kondisi aktual sumber daya ikan tembang yang didaratkan di PPN Karangantu, hasil tangkapan yang memaksimalkan keuntungan dan implikasinya bagi pengelolaan. Penelitian dilakukan di PPN Karangantu, Banten pada bulan Februari 2013 hingga Maret 2013. Hasil tangkapan maksimal diperoleh pada kondisi MSY sebesar 201863 kg dengan upaya sebesar 1549 trip. Pada kondisi MEY, upaya yang dilakukan lebih rendah yaitu 1 298 trip dengan hasil tangkapan maksimal sebesar 196580 kg. Total Allowable Catch (TAC) yang diperoleh sebesar 142 341 kg. Kondisi aktual sumber daya ikan tembang yang ditangkap di Teluk Banten saat ini telah mengalami overfishing dan diduga nelayan mengalami kerugian secara ekonomi . Hasil tangkapan lestari secara ekonomi untuk ikan tembang sebesar 196580 kg. Implikasinya terhadap kebijakan adalah pengaturan upaya penangkapan dengan batasan sebesar 1298 trip dan penetapan kuota hasil tangkapan sebesar 142341 kg.
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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