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: The Relationship Between Plankton  Community Structure and Water Conditions in Margagiri Grenyang Beach,  Banten Bay
Abstrak: Pantai Margagiri-Grenyang memiliki berbagai kegiatan industri yang dapat mengganggu kestabilan kondisi perairan dan struktur komunitas organisme di wilayah tersebut. Penelitian ini bertujuan menganalisis komposisi dan kelimpahan jenis plankton, indeks keanekaragaman, keseragaman, dan dominansi, serta keterkaitannya dengan kualitas perairan di kawasan perairan tersebut. Penelitian ini dilakukan pada bulan Juli sampai November 2022 dengan enam stasiun. Parameter yang dianalisis meliputi kualitas air, fitoplankton dan zooplankton. Struktur komunitas plankton dianalisis menggunakan pendekatan indeks biologi. Fitoplankton dan zooplankton yang ditemukan berturut-turut terdiri dari enam kelas dan lima kelas. Genus fitoplankton yang mendominasi berasal dari Bacillariopyceae, sedangkan untuk zooplankton berasal dari genus Protozoa. Hasil pengamatan menunjukkan indeks keanekaragaman, keseragaman, dan dominansi fitoplankton secara berturut-turut sebesar 1,2733-2,5515; 0,3849-0,8003; dan 0,1106-0,4912. Adapun untuk zooplankton secara berturut-turut sebesar 1,6310-2,1476; 0,7723-0,8996 dan 0,1509-0,2414. Berdasarkan struktur komunitas yang terbentuk terlihat bahwa plankton masih dapat tumbuh dan berkembang. Struktur komunitas plankton di perairan Margagiri-Grenyang mencerminkan kondisi keadaan stabil dan terjadi tekanan ekologis terhadap biota di habitat tersebut., Margagiri-Grenyang Beach has various industrial activities that can destabilize the water conditions and community structure of organisms in the area. This study aims to analyze the composition and abundance of species plankton, diversity index, evennes, and dominance, and their relationship with water quality in the water area. This research was conducted from July to November 2022 with six stations. The parameters analyzed include water quality, phytoplankton, and zooplankton. The plankton community structure was analyzed using the biological index approach. Phytoplankton and zooplankton found consisted of six classes and five classes, respectively. The dominating phytoplankton genus comes from Bacillariopyceae, while for zooplankton comes from the genus Protozoa. The observation results showed that the indices of diversity, evennes, and dominance of phytoplankton were 1.2733-2.5515; 0.3849-0.8003; and 0.1106-0.4912, respectively. As for zooplankton, they were 1.6310-2.1476; 0.7723-0.8996 and 0.1509-0.2414, respectively. Based on the community structure formed, it appears that plankton can still grow and develop. The structure of the plankton community in the Margagiri-Grenyang waters reflects stable conditions and ecological pressure on the biota in the habitat.
Keyword: Banten Bay, plankton, structure community, water quality.

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