Judul: Status Kualitas Air di Perairan Pantai Margagiri-Grenyang, Teluk  Banten
Abstrak: Pantai Margagiri-Grenyang merupakan salah satu pantai yang berada di wilayah Teluk Banten. Pertambahan jumlah penduduk yang begitu pesat menyebabkan adanya peningkatan aktivitas manusia yang semakin tinggi. Hal ini dapat memicu meningkatnya masuknya bahan pencemar ke badan air. Perairan yang tercemar oleh bahan pencemar akan berdampak pada biota, karena biota akan mengakumulasi bahan pencemar yang ada di perairan. Oleh karena itu perlu ditentukan status mutu kualitas air pada perairan tersebut. Parameter yang diamati adalah suhu, kekeruhan, TSS, pH, salinitas, oksigen terlarut, amonia, nitrat, nitrit, dan total fosfat. Pengukuran terhadap parameter tersebut dilakukan dengan dua cara yaitu di lapangan (in-situ) dan di laboratorium. Metode yang digunakan adalah Metode STORET, Indeks Pencemaran, dan Indeks CCME. Berdasarkan hasil analisis didapatkan bahwa ketiga metode didapati tingkat pencemaran yang berbeda-beda. Tingkat pencemaran berdasarkan Metode STORET termasuk kategori cemar ringan, lalu baik hingga tercemar ringan berdasarkan Indeks Pencemaran, dan baik hingga cukup baik berdasarkan Indeks CCME.
Keyword: baku mutu, CCME, indeks pencemaran, kualitas air, STORET, CCME, pollution index, quality standard, STORET, water quality

Judul: Tingkat Pencemaran di Perairan Pantai Bojonegara, Teluk Banten Berdasarkan Parameter Fisika-Kimia Perairan
Abstrak: Kondisi kualitas air yang baik di suatu perairan sangat penting untuk mendukung keberlangsungan hidup organisme yang hidup di dalamnya. Penentuan status mutu suatu perairan penting dilakukan dalam menduga kondisi pencemaran suatu perairan. Penelitian ini bertujuan mengkaji status mutu air dan indeks pencemaran perairan pantai Bojonegara, Teluk Banten. Pengambilan sampel dilakukan pada bulan Januari-Februari dan bulan Agustus-Oktober 2020 dari enam stasiun penelitian. Parameter yang dianalisis antara lain suhu, salinitas, kecerahan, kekeruhan, TSS, pH, DO, nitrat, dan fosfat total. Hasil analisis yang diperoleh dibandingkan baku mutu berdasarkan PP No 22 Tahun 2021. Berdasarkan hasil pengamatan suhu (28.4-37.5oC), salinitas (0-38 ppt), kecerahan (0.05-4.7 m), kekeruhan (1.1-380 mg/l), TSS (0.7-415 mg/l), pH (6.63-8.2), DO (3.3-7.5 mg/l), nitrat (0.001-0.745 mg/l), dan fosfat total (0.001-0.377 mg/l), menunjukan bahwa sebagian parameter masih tergolong dibawah baku mutu, beberapa parameter kurang sesuai dengan baku mutu perairan (antara lain TSS, kekeruhan, nitrat, dan fosfat total). Berdasarkan hasil perhitungan indeks pencemaran perairan pantai Bojonegara memiliki indeks pencemaran kategori tercemar ringan hingga sedang (2.988-7.561)., Good water quality conditions in marine environment are important to support the survival of living organism, and hence, needed to estimate the status of water pollution. Determination of water quality status is needed to do in estimating the condition of water pollution. This study aims to examine the status of the water quality and water pollution index of Bojonegara coastal waters, Banten Bay. Sampling was carried out in January February and August-October 2020 at six stations. Parameters analyzed included temperature, salinity, transparency, turbidity, TSS, pH, DO, nitrate, and total phosphate. The results were compared with the water quality standards based on Gov. Reg. No 22 of 2021. Based on the observations of temperature (28.4-37.5oC), salinity (0-38 ppt), transparency (0.05-4.7 m), turbidity (1.1 -380 mg/l), TSS ( 0.7-415 mg/l), pH (6.63-8.2), DO (3.3-7.5 mg/l), nitrate (0.001-0.745 mg/l), and total phosphate (0.001 - 0.377 mg/l), indicating that some parameters were still below the quality standard and some parameters were not in accordance with the water quality standard (including TSS, turbidity, nitrate, and total phosphate). Based on the results of the calculation of the pollution index, Bojonegara coastal waters were classified into the light to moderately polluted category (2.988-7.561).
Keyword: Baku mutu, Bojonegara, indeks pencemaran, kualitas air

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