Judul: Pengaruh Sarcotesta dan Kadar Air Benih terhadap Viabilitas, Kandungan Total Fenol dan Daya Simpan Benih Pepaya (Carica papaya L.)
Abstrak: Rendahnya daya simpan merupakan salah satu permasalahan dalam pengembangan benih pepaya. Penurunan kadar air dapat menekan laju metabolisme dan merupakan salah satu upaya untuk meningkatkan daya simpan benih.
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Judul: Pengaruh pemberian antioksidan sebelum simpan terhadap viabilitas dan vigor benih pepaya (Carica papaya L.)
Abstrak: Penelitian h i bertujuan untuk mengetahui pengaruh pemberian antioksidan sebelum simpan terhadap viabilitas dan vigor benih pepaya (Carica papaya L.). Benih pepaya yang digunakan adalah genotipe IPB-1 yang dipanen pada tanggal 2 April 2006. Benih tersebut diperoleh dari kebun percobaan Pasir Kuda, Ciomas melalui PKBT (Pusat Kajian Buah-buahan Tropika) IPB, Bogor. Rancangan percobaan yang digunakan dalam penelitian ini adalah Rancangan Petak Terbagi (Split Plot Design) 2 faktor dengan ulangan tersarang dalam petak utama. Fakor I adalah periode simpan (P) yang terdiii dari 5 taraf yaitu, periode simpan 0 minggu, 3 minggu, 6 minggu, 9 minggu dan 12 minggu. Faktor I ini digunakan sebagai petak utama. Sedangkan faktor I1 yang digunakan sebagai anak petak adalah perlakuan antioksidan yang terdiri dari 6 perlakuan yaitu, tanpa perlakuan (Al), perendaman dengan air (Ail), perendaman dengan curcuma 150 ppm (A3), perendaman dengan a-tokoferol 200 ppm (A4), perendaman dengan Butylafed Hydroxytoluene (BHT) 100 ppm (A5) dan perendaman dengan asam askorbat 350 ppm (A6). Setiap perlakuan terdiri dari 3 ulangan sehmgga secara keseluruhan terdapat 90 satuan percobaan. Perlakuan antioksidan diberikan sebelum penyimpanan benih (Pre-storage) dengan cara perendaman benih selama 2 jam pada masing-masing perlakuan. Sebelum perlakuan, benih diekstrak dari buah dan dibersihkan dari sarcotesta kemudian dikering-anginkan selama 16 jam sampai kadar air benih mencapai level 1 1-13%. Setelah perlakuan, benih kembali dikering-anginkan sampai kadar air semula (1 1- 13%) yang kemudian disimpan dalam kemasan plastik sealer.
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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