Judul: Perbandingan Algoritma Message Digest 5 (MD5) Dan Secure Hash Algorithm 1 (Shai) Untuk Autentikasi Pesan
Abstrak: Seiring dcngan meningkatnya penggunaan internet sebagai media pertukaran pcsan. metodc pcngamanan pcsan menjadi sangat penting. Nilai suatu pesan yang ingin dijaga keutuhan atnu intcgritasnya menycbabkan pesan tcrscbut hanya baleh dimodifikasi olch pihak yang bcrhak. Namun pada rcalitanya, pesan tersebut akan mendapat ancaman dari scorang penyusup. Bentuk ancaman terjadi apabiJa pcnyusup dcngan suatu cara. dapat mengubah isi pesan terscbut untuk bcrbagai kepcntingan. Apabila isi pesan telah bcrubah dad bentuk aslinya, maka pesan terscbut dikatakan sudah tidak aulcnlik (asli) Iagi. Snatn metodc yang efektif untuk mcnguji kcautentikan suatll pesan digllnakan tcknik kriptografi. Pada kal)'a ilmiah ini akan dibahas algoritma Message Digest 5 (MDS) dan Secure !-lash Algorithm (SHAI) untuk autentikasi pesan.
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Judul: Modifikasi Algoritme Fungsi Hash Md5 Didasarkan Pada Analisis Syarat Cukup Serangan Diferensial
Abstrak: Salah satu primitif kriptografi modern adalah fungsi hash kriptografi, atau sering disebut fungsi hash satu-arah. Dari segi transformasinya, fungsi hash didefinisikan sebagai fungsi yang memetakan bitstring dengan panjang sebarang ke bitstring dengan panjang tetap. Output dari fungsi hash adalah nilai hash (hash value). Di samping itu, dari segi peranannya di dalam kriptografi, fungsi ini juga diharuskan memenuhi sifat satu arah dan tahan tumbukan. Fungsi hash h dikatakan bersifat satu arah apabila secara komputasi tak layak menentukan input x jika diketahui nilai hash y sehingga y = h(x). Di lain pihak, sifat tahan tumbukan dari h dimaknai secara komputasi tak layak menentukan pasangan input x dan x’ dengan x ≠ x’ sehingga outputnya sama, h(x) = h(x’) (terjadi tumbukan). Sifat satu arah dan tahan tumbukan menyebabkan fungsi hash salah satunya digunakan untuk melindungi integritas data dari pemalsuan. Sebagai ilustrasi, suatu pesan x dilabelkan dengan nilai hashnya y = h(x). Kita bisa memalsukan x apabila kita bisa menentukan pesan lain x’ ≠ x sehingga h(x’) = y (mempunyai label yang sama dengan x). Jika ini yang terjadi maka fungsi hash yang bersangkutan dikatakan tidak aman, dengan kata lain x’ bisa digunakan untuk memalsukan x.
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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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