Judul: Biologi Populasi Kerang (Telescopium telescopium dan Cerithidea obtusa) dan Keterkaitannya dengan Karakteristik Habitat Mangrove di Kawasan Beejay Bakau Resort, Probolinggo
Abstrak: Ekosistem mangrove BeeJay Bakau Resort (BJBR) adalah ekosistem mangrove rehabilitasi seluas 89 ha yang dimanfaatkan masyarakat sekitar untuk mencari berbagai macam sumberdaya, salah satunya adalah gastropoda. Gastropoda merupakan biota yang dapat ditemukan secara luas baik di darat, air, dan sebagian di ekosistem mangrove. Dua spesies yang banyak ditemukan adalah Telescopium telescopium dan Cerithidea Obtusa. Biota ini memiliki potensi untuk dikembangkan menjadi bioindikator, secara ekonomi, dapat pula dimanfaatkan untuk dijual dan dikonsumsi. T. telescopium memiliki kandungan protein sebesar 12,16% dan lemak 0,38%. C. obtusa memiliki kandungan gizi protein 13,8% dan lemak 2,8%. Pemanfaatan yang berlebihan dapat menyebabkan menurunnya kelimpahan dari gastropoda. Berdasarkan potensi tersebut, dua spesies yang dapat ditemukan di pesisir Probolinggo Jawa Timur menarik untuk ditelaah lebih lanjut mengenai interaksinya dengan ekosistem mangrove untuk dapat dikelola secara berkelanjutan. Penelitian ini dilakukan pada Bulan Desember 2020 di ekosistem mangrove BJBR, Probolinggo. Penentuan stasiun dilakukan dengna menggunakan purposive sampling berdasasrkan karakteristik ekosistem mangrove. Pengumpulan data gastropoda dilakukan dengan menggunakan transek kuadran gastropoda (1x1m). Karakteristik lingkungan di semua stasiun dianalisis menggunakan PCA (Principal Component Analysis) sedangkan sebaran gastropoda berdasarkan struktur ekosistem mangrove dianalisis menggunakan CA (Correspondence Analysis). Hasil penelitian menunjukkan bahwa kelimpahan gastropoda T. telescopium sebesar 144 ind dan C. obtusa sebanyak 29 ind. T. telescopium memiliki kepadatan yang lebih tinggi dibandingkan C. obtusa dengan pola persebaran mengelompok hampir di seluruh stasiun. Secara umum, kedua jenis gastropoda memiliki pola pertumbuhan allometrik negatif dengan kondisi yang baik untuk dimanfaatkan karena memiliki bentuk yang montok. Kehidupan gastropoda dipengaruhi oleh karakteristik ekosistem mangrove. C. obtusa berkuran kecil dan besar berasosiasi dengan mangrove dengan kerapatan jarang A. marina (<10). T. telescopium berkuran kecil berasosiasi dengan mangrove R. mucronata (<10). T. telescopium berukuran sedang dapat ditemukan di mangrove R. stylosa (≥ 15) kerapatan tinggi. Sedangkan T. telescopium besar dapat ditemukan di mangrove A. marina dan R. mucronata dengan kerapatan sedang hingga tinggi (≥ 15 dan ≥ 10 - <15).
Keyword: Beejay Bakau Resort, gastropoda, abundance, mangrove

Judul: Variasi Karakter Morfometrik Gastropoda Berdasarkan Karakteristik Habitat Mangrove di Kawasan Bee Jay Bakau Resort, Probolinggo
Abstrak: Beejay Bakau Resort (BJBR) in Probolinggo is a mangrove ecotourism rehabilitation area that has been planted for a long period. There are seven different varieties of mangroves in the BJBR area. The mangrove environment in BJBR is in good shape, and the local population used to catch shellfish in large quantities, but there is a section of the mangrove that has been harmed and even killed as a result of human activity (anthropogenic). The presence of related biota or gastropods is strongly influenced by the density of mangroves as the ecosystem's principal constituent. Gastropods play a crucial function in the mangrove ecosystem's food chain cycle. Environmental factors, food, and predators all influence the abundance and distribution of gastropods. The abundance of mangrove litter occurs because the density of mangroves is also great, allowing the snail to feed on the litter. This study took place in the BJBR area in December 2020. Purposive sampling approach was used to determine sampling based on the existence of mangrove vegetation zoning. The quadratic transect method was used to collect gastropod and mangrove vegetation data, while environmental parameters were measured in situ. Principal Component Analysis was used to investigate the association between morphometric characters and snail species (PCA). Correspondent Analysis was used to examine the link between research stations and morphometric features (CA). The findings revealed that there are seven families of gastropods in the BJBR area (Ellobiidae, Littorinidae, Potamididae, Nassaridae, Cerithiidae, and Muricidae) and 23 species of gastropods. The study station's average gastropod diversity and uniformity are in the middle range, while dominance is in the low range. Because numerous medium and big gastropods were found in the area, gastropods have a relationship between fluctuations in environmental variables and high mangrove density. A sedimentary substrate with clay proportion is present at all research stations. The findings of this study may be relevant in developing BJBR management policy based on mangrove ecotourism.
Keyword: abundance, Bee Jay Bakau Resort, gastropods, mangrove

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