Judul: Pengkajian Umur Petik Dan Kualitas Buah EmpaAt Varletas Pepaya (Carica papaya L.)
Abstrak: Penelitian ini bertujuan untuk mengetahui umur petik dan mengkaji kualitas buah empat varietas pepaya. Penelitian dilaksanakan mulai bulan Januari hingga Juni 2002 di Kebun Percobaan Tajur dengan ketinggian 250 m di atas permukaan laut. Percobaan disusun dengan Rancangan Acak Lengkap (RAL) satu faktor dengan empat taraf perlakuan varietas yaitu Solo (V1), Eksotika II (V2), Redking (V3) dan Pakuan (V4).
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Judul: Umur Petik Dan Kualitas Buah Pepaya (Carica papaya L.)
Abstrak: Penelitian ini bertujuan untuk mengetahui umur petik dan kualitas buah pepaya (Carzca papayu L.) genotipe IPB 1, IPB 10A, PB 174, STR 6-4, dan STR 6-4 x PB 174 dengan mempelajari kualitas buah pada tiga umur petik dan uji kesukaan konsumen. Penelitian dilaksanakan mulai bulan September 2005 hingga April 2006 di kebun percobaan Pusat Kajian Buah-Buahan Tropika (PKBT) IPB, Tajur, Bogor. Lokasi kebun terletak pada elevasi 250-300 mdpl. Analisis sifat fisik dan kimia buah pepaya dilakukan di Laboratorium PKBT IPB, serta Laboratorium Produksi Tanaman, Departemen Agronomi dan Hortikultura, Fakultas Pertanian, IPB. Percobaan lapang dilakukan dengan Rancangan Acak Lengkap (RAL). Percobaan dilakukan dengan faktor tunggal yaitu tiga umur petik sebagai perlakuan dan enam ulangan untuk setiap perlakuan. Setiap tanaman (dalam genotipe dan kelamin yang sama) diambil tiga contoh buah pepaya untuk setiap umur petik, sehingga tanaman yang diperlukan sebagai ulangan sebanyak enam pohon. Buah pepaya yang dibutuhkan untuk ketiga umur petik adalah 18 buah dengan genotipe dan kelamin yang sama dan terdapat delapan genotipe dan kelamin yang sama, sehingga dihasilkan 144 buah sebagai satuan percobaan.
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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