Judul: Pengaruh Pemberian Abu Volkan Erupsi Gunung Kelud dan Pupuk Kandang terhadap Beberapa Sifat Kimia Tanah Podsolik Merah Kuning Jasinga Serta Serapan P, K, Ca, dan Mg Tanaman Jagung (Zea mays L.)
Abstrak: Gunung Kelud merupakan volkan muda di Sub Zone Blitar, Jawa timur. Pada Bulan Januari 1990, gunung tersebut meletus dengan mengeluarkan jutaan meter kubik material. Pemanfaatan bahan erupsi gunung tersebut dalam usaha pengembangan pertanian belum dicoba, walaupun telah diyakini bahwa dalam jangka panjang dapat meningkatkan kesuburan tanah.
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Judul: Pengaruh Penambahan Bahan Volkan Galunggung Terhadap Perubahan Beberapa Sifat Kimia Tanah Dan Pertumbuhan Tanaman Jagung (Zea mays L.) Pada Podsolik Merah Kuning Gajrug
Abstrak: Usaha untuk meningkatkan kesuburan tanah dapat ditempuh dengan memberikan masukan pupuk. Masukan pupuk. tersebut dapat berasal dari pupuk buatan dan pupuk alam. Pupuk alam dapat dibedakan atas bahan organik dan bahan volkan. Penggunaan pupuk alam khususnya bahan volkan masih belum mendapatkan perhatian. Hal ini disebabkan hasil yang diperlihatkannya memerlukan waktu yang lebih lama, tetapi jumlah jenis unsur hara yang dapat disumbangkan jauh lebih banyak dibandingkan dengan pupuk buatan. Tujuan penelitian ini adalah untuk mengetahui pengaruh penambahan bahan volkan Galunggung yang berbentuk lahar dan abu terhadap perubahan beberapa sifat kimia tanah Podsolik Merah Kuning Gajrug, yaitu: pH-tanah, Al-dd, Fe- dd, Ca-dd, Mg-dd, K-dd, dan Na-dd, serta respon pertumbuhan tanaman jagung. Selain itu juga ingin mengetahui perbandingan tingkat hancuran iklim yang terjadi pada lahar dan abu volkan Galunggung. Penelitian ini merupakan percobaan pot yang dilaksanakan di rumah kaca Jurusan Tanah, Faperta, IPB. Rancangan percobaan yang digunakan adalah Rancangan Faktorial 2 x 5 dengan 3 kali ulangan dalam Rancangan Acak Lengkap.
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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