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: 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: Prevalence of Bird Lice on Rock Pigeon (Columba livia) in 99Wonderland Park, Selangor, Malaysia
Abstrak: Rock Pigeon (Columba livia) have coexisted with humans for thousands of years and are used for various purposes such as food and in sports. Rock pigeons may have the potential to be infested with a wide range of ectoparasites, which can have a significant impact on their life cycle. This study aims to measure the prevalence of Columba livia with bird lice in 99Wonderland Park, Selangor, Malaysia in the year 2020 and to ascertain the impact of bird lice on the health of these infested birds. Data were collected from clinical records for the month of January to December in the year 2020 from 99Wonderland Park, Selangor, Malaysia. Lice were identified in 42 of the 80 Rock pigeons examined so, the overall prevalence of lice infestations was 52.5%. The prevalence of ectoparasites was found to be higher in young Rock pigeons (60.4%) as compared to adult Rock pigeons (37.4%). Columbicola columbae (wing lice) and Colpocephalum turbinatum (body lice) are two species of lice that have been detected. Body lice were more prevalent in young Columba livia birds at 47.6% whereas wing lice were more prevalent in adult Columba livia birds at 16.7%. Most of the lice were found in the thorax and abdomen area followed by the head and neck area., Merpati Batu (Columba livia) telah hidup berdampingan dengan manusia selama ribuan tahun dan digunakan untuk berbagai keperluan seperti makanan dan olahraga. Merpati batu dapat terinfestasi dengan berbagai ektoparasit, yang dapat berdampak signifikan pada siklus hidup mereka. Penelitian ini bertujuan untuk mengetahui prevalensi Columba livia dengan kutu burung di 99 Wonderland Park, Selangor, Malaysia pada tahun 2020 dan untuk memastikan dampaknya terhadap kesehatan burung yang terinfestasi. Data dikumpulkan dari catatan klinis dari bulan Januari hingga Desember tahun 2020 dari 99Wonderland Park, Selangor, Malaysia. Kutu diidentifikasi pada 42 dari 80 merpati batu yang diperiksa sehingga, prevalensi keseluruhan infestasi kutu adalah 52,5%. Prevalensi ektoparasit ditemukan lebih tinggi pada merpati batu muda (60,4%) dibandingkan dengan merpati batu dewasa (37,4%). Columbicola columbae (kutu sayap) dan Colpocephalum turbinatum (kutu badan) adalah dua spesies kutu yang telah ditemukan. Kutu badan lebih banyak ditemukan pada burung Columba livia muda sebesar 47,6% sedangkan kutu sayap lebih banyak ditemukan pada burung Columba livia dewasa sebesar 16,7%. Sebagian besar kutu ditemukan di daerah dada dan abdomen diikuti daerah kepala dan leher.
Keyword: Columba livia, prevalence, ectoparasite, wing lice, body lice, Columba livia, prevalensi, ektoparasit, kutu sayap, kutu badan