Judul: Pengembangan Aplikasi Pertukaran SMS Rahasia Berbasis Android Menggunakan Algoritme RSA
Abstrak: Delivering message using short message service (SMS) is very familiar among the users of cellular phone in Indonesia. SMS center (SMSC) is required to keep and deliver SMS from one device to another device. The weakness of SMS technology of is that the encryption only works between mobile station (MS) and base transceiver station (BTS). Meanwhile on the other side, it is fully opened without encryption so that some attacks such as hacking and modification become highly possible. This research utilized RSA algorithm to secure the delivery of SMS between one device and another. The advantage of RSA method is that it does not need to exchange secret key and it is able to keep the original content of SMS. It was found that RSA applications can be applied in order to guarantee the security of SMS contents.
Keyword: secret SMS, RSA, encrypt, decrypt, cryptography, Android

Judul: Pengembangan Aplikasi Penandaan Digital pada SMS Menggunakan Algoritme MD5-RSA
Abstrak: Cellular phone is one of the most popular communication device. Unfortunately, this popularity also increases number of crime using cellular phone. SMS fraud is one kind of crime using cellular phone. Another method of sender verification is required to avoid this kind of crime. Digital signatures can be used to verify the sender. The sender is sending SMS with digital signature and the receiver will verify the signature. This application is developed using J2ME and MD5-RSA algorithm as the signature method. This application also uses Bouncy Castle lightweight cryptography API for J2ME as cryptography library. Key pair parameters can be generated in 15 seconds to 4 minutes depends on the cellular phone technology. The digital signature can be formed with an average time of 1.35 seconds to 1.97 seconds. Digital signature verification can be done with an average time of 3.73 seconds to 12.09 seconds. The digital signature is generated using private key parameters and verified using public key parameters. Only the correct key pair will provide a valid result. Time to send signed-SMS depends on the network capability. There is no difference compared to sending normal SMS.
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Judul: Kandungan Logam Berat (Hg, Cd, Pb, dan Cu) pada Ikan Baronang Siganus javus (Linnaeus, 1766) di Perairan Teluk Banten dan Sekitarnya
Abstrak: Kegiatan antropogenik dapat memberikan masukan limbah berupa logam berat sehingga konsentrasinya di perairan meningkat dan menyebabkan akumulasi, khususnya pada ikan baronang. Penelitian ini bertujuan menduga tingkat akumulasi kandungan logam berat (Hg, Cd, Pb, dan Cu) pada daging ikan baronang (Siganus javus) di perairan Teluk Banten dan sekitarnya. Pengambilan 30 g hingga 50 g sampel daging ikan dilakukan setiap bulan dari bulan Agustus hingga Oktober 2020 dan analisis kandungan logam berat (Hg, Cd, Pb, dan Cu) pada daging ikan baronang dilakukan pada Februari 2021 menggunakan metode atomic absorption spectrophotometry (AAS). Kandungan logam berat Hg, Cd, dan Pb pada daging ikan baronang berada di bawah batas deteksi AAS, sedangkan kandungan logam berat Cu pada daging ikan kecil berkisar 0,348 mg kg-1 hingga 1,530 mg kg-1 dan ikan besar kurang dari 0,015 mg kg-1 hingga 5,390 mg kg-1. Bioakumulasi logam Cu pada ikan baronang ukuran kecil dan besar termasuk akumulasi rendah hingga tinggi sedangkan untuk jenis logam lainnya termasuk akumulasi rendah. Batas aman konsumsi daging ikan baronang untuk orang dewasa (50 kg) yaitu 32,468 kg daging/minggu sedangkan untuk anak-anak (15 kg) sebanyak 9,740 kg daging/minggu., Anthropogenic activities contribute heavy metals so that their concentration in the waters increases and causes accumulation, especially in streaked spinefoot. This study aims to estimate the level of accumulation of heavy content (Hg, Cd, Pb, and Cu) in the meat of streaked spinefoot (Siganus javus) in the waters of Banten Bay and its surroundings. Sampling of 30 to 50 grams of fish meat is carried out every month from August to October 2020 and analysis of heavy metal content (Hg, Cd, Pb, and Cu) in streaked spinefoot meat was carried out in February 2021 using atomic absorption spectrophotometry (AAS). The content of heavy metals Hg, Cd, Pb in the meat of streaked spinefoot is below the detection limit AAS, while the content of heavy metal Cu in the small fish ranged from 0.348 to 1.530 mg kg-1 and large fish is less than 0.015 mg kg-1 to 5.390 mg kg-1. Bioaccumulation of Cu metal in small and large streaked spinefoot included low to high accumulation, while for other types of metal it was low. The safe limit for consumption of streaked spinefoot meat for adults (50 kg) is 32.468 kg of meat/week, while for children (15 kg) it is 9.740 kg of meat/week.
Keyword: Akumulasi, Ikan baronang, logam berat, Teluk Banten, Accumulation, Banten Bay, heavy metals, Streaked spinefoot