Judul: Analisis dan Implementasi Pembagian Rahasia Menggunakan Skema Ambang Shamir
Abstrak: key is used to keep secret in order not easily accessible by others. The key itself also requires a way to keep it from accessed by someone else. A threshold secret sharing scheme developed by Adi Shamir is one way to keep a secret key. This scheme's objective is to divide a secret key S into n parts, such that S is easily reconstructed from any t parts, but when less than t parts are known there is no information about the secret key can be obtained. This research's objectives are to explain how to share a secret using Shamir's threshold scheme, to analyze the security of Shamir's threshold scheme, and to implement Shamir's threshold secret sharing scheme using Wolfram Mathematica 10. Shamir threshold scheme consists of two stages, namely sharing stage and reconstruction stage. This scheme is computationally secure, since it works on integers modulo p, so that when only t – 1 parts of the secret number are known, it is very difficult to guess the value of S.
Keyword: Bogor Agricultural University (IPB), Lagrange interpolation, secret sharing scheme, cryptography

Judul: Analysis and implementation feldman verifiable secret sharing scheme
Abstrak: Informasi yang bersifat rahasia membutuhkan penjagaan supaya tidak dapat diakses oleh pihak yang tidak berkepentingan. Salah satu cara untuk menjaganya adalah dengan menggunakan skema pembagian rahasia. Skema pembagian rahasia yang diverifikasi merupakan perkembangan dari skema pembagian rahasia. Skema Shamir adalah salah satu contoh dari skema pembagian rahasia yang didasari oleh interpolasi Lagrange. Skema Feldman merupakan perbaikan dari kelemahan yang dimiliki oleh skema Shamir. Skema Feldman juga merupakan salah satu contoh dari skema pembagian rahasia yang diverifikasi. Penelitian ini bertujuan untuk menjelaskan cara kerja pembagian rahasia menggunakan skema Feldman, menerapkan skema Feldman dalam pembagian rahasia menggunakan perangkat lunak Wolfram Mathematica 10, dan menganalisis keamanan skema Feldman. Tahapan skema Feldman terdiri atas dua bagian yaitu pembagian kunci dan penyusunan kunci. Tahap pembagian kunci terdiri atas tahap penentuan parameter dan tahap distribusi, sedangkan tahap penyusunan kunci terdiri atas tahap verifikasi dan tahap penyusunan ulang. Skema Feldman memiliki kebocoran mengenai rahasianya karena nilai dari komitmen yang diberikan secara umum. Hal tersebut tidak terlalu dipermasalahkan, karena upaya mendapatkan rahasia dari kebocoran tersebut harus menggunakan logaritma diskret yang masih tak layak untuk dipecahkan., Confidential information requires a protection such that it cannot be accessed by unauthorized parties. One way to keep it safe is by employing a secret sharing scheme such as Shamir’s scheme which developed based on Lagrange interpolation. Verifiable secret sharing scheme is an improvement of secret sharing scheme, such as Feldman’s scheme which overcomes the weakness of Shamir’s scheme. The purposes of this study are to describe the secret sharing mechanism by using the Feldman’s scheme, to apply Feldman’s scheme in sharing secret by using Mathematica 10, and to analyze the security aspect of Feldman’s scheme. Feldman’s scheme consists of two stages, namely key distribution and key preparation. Key distribution comprises the step of determining parameters and distribution phase, whereas key preparation consists of verification and reconstruction phases. Even though Feldman’s scheme might have a leak about the secret because of the value from commitments given in general, it is not too problematic, because to get the secrets from the leak we must perform a discrete logarithm which is infeasible from the perspective of computation.
Keyword: interpolasi Lagrange, logaritma diskret, skema pembagian rahasia, skema pembagian rahasia yang diverifikasi

Judul: Biology and ecology of the buffalo fly, haematobia exigua de meijere (diptera:muscidae)
Abstrak: The life history of the buffalo fly was observed at room temperature of 27°-29.5°C and at a relative humidity of 48-68 percent. The eggs hatched after 17-22 hours, with an average of 18 hours. First instar larvae measured 1.25 + 0.16 mm long and 0.27 + 0.037 mm wide. reach the second larval stage. It took 6-12 hours to the second instar larvae measured 2.676 +0.187 mm long and 0.353 +0.028 mm wide. The second instar took about 12-24 hours to reach the third larval stage. The third instar measured 6.833 + 0.189 mm long and 0.919 + 0.051 mm wide. It took about 2-3 days for the third instar to become pupae. Duration of the pupal stage was about 5-7 days before the adults emerged. Under laboratory condition, the buffalo fly completed its life cycle in 9.5 to 10.5 days, whereas under field condition it took 9-14 days with an average of 10.5 days. The growth ratio which was based on the measurements of the cephalo-pharyngeal skeleton of each instar was 1.797. The preoviposition period was 8-12 days and mating usually occurred on the 6th or 7th day. The longevity of the male was 29 days, whereas it was 32 days in the female. The range of egg production under laboratory condition was between 20-139 per female fly. The belly and hind legs of the carabao were the most preferred habitat either during cloudy and cool dry or shiny and warm day. When the weather was clear and the carabao was in the shade, the flies tended to be more distributed particularly on the shoulder, dewlap, back and horns. The carabaos had relatively fewer Musca sp. and Stomoxys calcitrans than cattle; never the less carabaos had a higher infestation of buffalo fly than cattle. Oviposition occured either during the day or night but the buffalo flies were more active during the night than in the day time. The effect of various lengths of exposure time of manure in relation to the oviposition was profound. observed, the maximum number of the buffalo flies was occurred when the dung was exposed for 30 minutes. With increasing time of exposure the number and variety of insects also increase. It was evident that Sepsidae and psychodidae were the most dominant insects emerging from the dung. The number of buffalo flies also increased with increasing
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