Judul: Electronic power of attorney by using digital signature algorithm
Abstrak: The protocol of electronic power of attorney is an online form of a power of attorney with paper media. Signatures used in electronic power of attorney is a digital signature. Digital signature algorithm used is the Digital Signature Algorithm (DSA). The scopes of this research are: 1) the protocol of electronic power of attorney that will be made, including an unstamped under the counter power of attorney, 2) created Protocol doesn’t include the protocol of online submission form of power of attorney to the tax officials, 3) there are two Digital signatures made, endorser and endorsee. The method of this research consists of several processes, the problem analysis, literature review, the making of electronic mail protocols, simulation making and security analysis. The protocol of electronic power of attorney is adapted to the making conditions of a power of attorney in Indonesia. The power of attorney is generally composed of the identity of endorser and endorsee, power transfer, and the signature of endorser and endorsee. It is assumed that in this study there has been a protocol of online form application of power of attorney to the tax man. This application form is in the form of watermarked file as a replacement of stamp. Power of attorney file is signed twice with DSA. The endorser made a power of attorney, signed and sent it to the endorsee. The endorsee verified the power of attorney. If it was appropriate, the endorsee signed it. The endorsee then run the command in accordance with the contents of a power of attorney. The power of attorney was taken to a third party. The third party verified the signature of endorser and endorsee. The simulation of electronic power of attorney protocol is built using Java programming language. The software used is Netbeans IDE 7.0.1. DSA which was taken from a java library and the hash function used is SHA1. From the simulation, the security of protocols can be ensured. The safety criteria which are fulfilled are the integrity of a power of attorney contents can be guaranteed, and the signature of endorser and endorsee can certainly be made by the person concerned. This research was carried out only by making electronic power of attorney protocol. This study does not include protocol of stamp replacement and notary. Power of attorney which has a powerful position in Indonesian law is a letter which is signed in front of a notary or signed by a notary, and stamped.
Keyword: Digital Signature Algorithm (DSA), java, protocols, electronic power of attorney

Judul: Sistem tanda tangan digital online untuk naskah dinas menggunakan algoritma DSA (Digital Signature Algorithm)
Abstrak: Digital signature is the result of a cryptographic transformation from a message with a certain length of bits that can provide a mechanism to verify the origin authentication, data integrity, and non-repudiation of the signatories. The purpose of this study is to implement digital signatures on official letter using the DSA algorithm and test the execution time for the process of key pair formation, signature formation, and signature verification. Users of the system consists of three entities, namely employees, admin, and the certification authority. The development system was able to generate the private key and public key, generate a signature in the form of a compressed file (zip), and verify the signature and the public key along with the certificate. Functionality test of the system showed that 100% of the functions work is well. Execution time test concluded that the type and size of the official letter was not directly related to the execution time when the signatures were generated dan verified. Verification test of signature with specific scenarios showed that the signature file was not resistant to the attempt of re-extraction and re-compression.
Keyword: official letter, DSA, digital signature

Judul: Infeksi Clostridium perfringens pada unggas dan cara - cara penanggulangannya
Abstrak: Clostridium perfringens atau disebut juga C. welchii adalah salah satu mikroba yang dapat menyerang unggas terutama ayam broiler dan kalkun yang dipelihara secara intensif dengan sistem litter. Kejadiannya bersifat sporadis dan merupakan masalah yang cukup besar, karena angka kematian unggas dapat mencapai 60 %. Clostridium perfringens adalah bakteri berbentuk batang dengan ukuran 0.9-1.3 x 3.0-9.0 mikrometer, tunggal atau berpasang-pasangan dan jarang membentuk rantai. Kuman yang bersifat Gram labil ini dapat membentuk spora yang terletak sentral atau sub terminal. Kuman ini tumbuh baik pada media agar darah, dalam suasana anaerob. Daya tahannya terhadap pemanasan ialah 2 jam pada suhu 100..°C atau akan rusak pada pemanasan dengan suhu 120 °C selama 20 menit. (Bergey, 1975). Secara normal C. perfringens terdapat dalam saluram pencernaan manusia maupun hewan, termasuk unggas. Pada saluran pencernaan unggas kuman ini terdapat dalam caecum dan usus besar, tetapi jarang pada usus kecil. ...
Keyword: