Judul: Autentikasi ijazah digital menggunakan algoritme tanda tangan digital dan pembagian rahasia threshold termodifikasi
Abstrak: Digital certificate is a digital file which is used as a companion of conventional certificate. Digital certificates can be made by educational institutions with the guarantee of data integrity and authentication. Digital certificate authentication can be performed using a digital signature. Certificate validation process requires the agreement of several parties. Threshold secret sharing schemes can be used on a digital certificate to accommodate the needs of certificate validation that involves many parties. However, there are certain conditions in the involvement of these parties, therefore the threshold secret sharing scheme needs to be modified. The purpose of this study was to implement a DSA digital signature scheme, modify the threshold Secret Sharing Scheme, and implement the modified threshold secret sharing scheme on digital certificate. Modified threshold secret sharing scheme consists of the modification process, the setup implementation, and the secret reconstruction process implementation. The DSA digital signature scheme is implemented and connected with the implementation of the modified threshold secret sharing scheme to accommodate signing process which involves many parties. This study has successfully implemented DSA digital signature scheme and the modified threshold secret sharing scheme
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Judul: Analisis keamanan dan kinerja algoritma Digital Signature Algorithm (DSA) pada proses pembentukan dan verifikasi tanda tangan digital
Abstrak: Digital Signature Algorithm (DSA) merupakan algoritma kriptografi otentikasi pesan yang menggunakan teknologi kunci publik dan Secure Hash Algorithm (SHA-1) dalam operasinya. Secara umum DSA dapat dideskripsikan sebagai algoritma kriptografi yang memproses pesan dalam sekumpulan bit (block)/ satuan waktu tertentu dengan menggunakan sepasang kunci publik dan kunci privat bagi proses pembentukan dan verifikasi tanda tangan digital.
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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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