Judul: Distribusi dan Struktur Komunitas Makrozoobentos di Pantai Kupang, Desa Lubuk Damar, Kecamatan Seruway, Kabupaten Aceh Tamiang.
Abstrak: Karakteristik substrat suatu perairan memiliki kaitan yang erat dengan jumlah jenis individu dari makrozoobentos yang ditemukan. Penelitian ini bertujuan menentukan distribusi dan struktur komunitas makrozoobentos di Pantai Kupang, Desa Lubuk Damar. Penelitian ini dilaksanakan pada bulan Agustus 2017 dan Januari 2018 di lima titik stasiun dan diidentifikasi dari bulan Agustus sampai Desember 2018. Pengumpulan data makrozoobentos dan sedimen dilakukan dengan metode line transect menggunakan corer. Makrozoobentos yang ditemukan terdiri dari 53 jenis dengan kepadatan total 103.981 individu/m2 yang dikelompokkan ke dalam 10 kelas. Makrozoobentos dari Kelas Polychaeta, Phascolosomatidea, dan Sipunculidea merupakan kelompok makrozoobentos yang ditemukan di semua titik stasiun. Indeks keanekaragaman dan indeks keseragaman tergolong rendah sedangkan indeks dominansi tergolong tinggi.
Keyword: Makrozoobentos, struktur komunitas, substrat

Judul: Keanekaragaman dan Distribusi Makrozobenthos di Perairan Pantai Cengkok, Teluk Banten.
Abstrak: Teluk Banten memiliki beberapa anak sungai yang salah satunya bermuara di Perairan Cengkok. Tipe substrat serta perubahan kualitas air akibat masukan partikel dari limbah aktivitas antropogenik di sepanjang sungai dan di sekitar wilayah pesisir dapat mempengaruhi struktur komunitas makrozoobentos. Penelitian ini bertujuan menganalisis nilai kepadatan, keanekaragaman, keseragaman, dominansi, status persebaran serta similaritas makrozoobentos di Perairan Pantai Cengkok, Teluk Banten. Penelitian dilakukan selama 5 bulan, sejak bulan Mei hingga September 2019, dengan titik pengambilan sampel sebanyak lima stasiun di Perairan Cengkok Teluk Banten. Data makrozoobentos diambil dengan menggunakan van veen grab sampler, dan setiap stasiun juga dilakukan pengukuran kualitas fisika kimia perairan. Makrozoobentos yang diperoleh selama penelitian terdiri dari empat kelas yaitu Bivalvia, Gastropoda, Polychaeta dan Malacostraca. Uji statistik PCA biplot menyatakan keberadaan makrozoobentos dipengaruhi oleh kualitas perairan serta tipe substrat. Kelas Bivalvia berkorelasi positif dengan kadar kecerahan, oksigen terlarut, tipe substrat pasir, dan liat. Kelas Polychaeta berkorelasi positif dengan salinitas dan pH.
Keyword: makrozoobentos, Teluk Banten, struktur komunitas, Teluk Banten

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