Judul: Running Time Test of IDEA Algorithm in Encryption and Decryption Data process.
Abstrak: International Data Encryption Algorithm (IDEA) is a symetric and cipher block cryptographic algorithm. This algorithm operates in the form of bit block with the block size of 64 bits. The objective of this research is to measure the performance of IDEA based on the execution time (ms) and memory usage (KB) at the time of encryption and decryption process. The Implementation is built using JAVA programming language. The result show that increasing the size of file means increase the amount of memory usage and execution time. Keyword : Cryptography, block cipher, IDEA
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Judul: Analisis dan implementasi algoritme 3 DES secara paralel
Abstrak: One of the data encryption algorithm known since 1977 is Data Encryption Standard (DES). One of the DES algorithm variants since 1999 is 3DES algorithm. In 3DES, DES algorithm is used three times for encryption and decryption process with different key for each test. The encryption and decryption computational time for DES main algorithm grows proportionally with the increasing size of input block plaintext and ciphertext. In this research, parallel processing is applied by dividing the data to several processes, so that the encryption and decryption process against blocks of data run in parallel. The Message Passing Interface is used for presenting parallelization of 3DES algorithm. The objectives of this research is to implement and analyze the complexity and the perfomance of 3DES algorithm both serially and parallelly. The mode of operation used for running 3DES algorithms is Electronic CodeBook (ECB). The analysis performed in this research includes the analysis of performance metrics and the experimental results of the 3DES algorithm both serially and parallelly. The results of this research are summarized as follows: 1. The execution of serial 3DES algorithm for encryption and decryption for files with greater sizes give longer time. For example, a file size of 4,009,016 bytes takes the encryption or decryption computational times about 957.87 seconds or 15.97 in minutes. 2. Parallelization of 3DES algorithm in the Electronic CodeBook mode performed in domain decomposition, that is input blocks are distributed to some processes that will work in parallel. However, the code containing I/O function is unparallelizable, because the access to memory is, by its very nature, sequential. 3. The speedup of 3DES parallel program grows proportionally with the increasing size of files until a certain limit. 4. To obtain a fixed value of efficiency in 3DES parallel programs, the size of the input block in this case (n) should be increased by 2p2 + p log2 p fold. The maximum efficiency value from 3DES parallel programs is absolutely one.
Keyword: block cipher, cryptography, Data Encryption Standard (DES), 3DES, Electronic CodeBook (ECB), parallel, Message Passing Interface (MPI)

Judul: Sintesis Pati Sagu Tertaut Silang Fosfat sebagai Bioadsorben Pb(II).
Abstrak: Logam timbal yang berasal dari perairan dan tanah dapat masuk ke dalam tubuh dan menyebabkan berbagai masalah kesehatan. Upaya yang sudah dilakukan untuk menanggulangi keracunan timbal adalah dengan cara menjerapnya. Salah satu bahan yang berpotensi untuk dijadikan bahan penjerap timbal adalah pati sagu tertaut silang fosfat (SgP). Untuk itu, penelitian ini bertujuan menentukan kondisi terbaik sintesis SgP dan kapasitas adsorpsi timbal oleh SgP sebagai bioadsorben dalam sistem pencernaan manusia secara in vitro. SgP disintesis pada suasana asam mengunakan pereaksi Na2HPO4:NaH2PO4 (3:2). SgP dengan nilai derajat substitusi fosfat tertinggi disintesis pada pH 6, suhu 30 oC, selama 30 menit, dan kecepatan pengadukan 100 rpm. Walaupun berpotensi sebagai penjerap timbal, kapasitas penjerapan SgP terhadap timbal lebih rendah dibandingkan dengan kapasitasnya untuk menjerap merkuri. Uji in vitro dilakukan pada beberapa kondisi yang sesuai dengan sistem pencernaan manusia. Kemampuan penjerapan timbal terbaik oleh SgP terjadi pada pH 8.6 yang merupakan kondisi pada usus kecil.
Keyword: adsorbsi, pati, sagu, taut silang, timbal