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"We will focus on these three components in a computer network. But what is a computer network? The reader should be aware that our use of the phrase computer network , from now on, will refer to the traditional computer network.A computer network is a distributed system consisting of loosely coupled computers and other devices. Any two of these devices, which we will from now onrefer to as network elements or transmitting elements without loss of generality, cancommunicate with each other through a communication medium. In order for these connected devices to be considered a communicating network, there must be a set of communicating rules or protocols each device in the network must follow to communicate with another device in the network. The resulting combination consisting of hardware and software is a computer communication network or computer network in short."

"Masalah kemanan di bidang informasi dan teknologi telah menjadi sesuatu yang penting dalam kinerja perusahaan. Keamanan jaringan yang digunakan patutnya dapat berjalan dengan optimal sehingga tidak membebani kinerja pekerjaan lainnya. Upaya optimasi sangat penting dan harus terus dilakukan untuk mendirikan sebuah jaringan berkeamanan tinggi dan mudah dikelola dalam jangkauan penggunaan yang luas. Firewall Fortigate sebagai perangkat yang dapat memberi keamanan jaringan dan kemudahan manajemen jaringan selayaknya dapat dikonfigurasi dengan optimal dan efisien. IPv4 Policy pada perangkat Firewall Fortigate merupakan konfigurasi yang sangat penting bagi kelangsungan kinerja jaringan yang aman dan optimal dengan memanfaatkan perangkat Firewall Fortigate di jaringan tersebut. Optimasi konfigurasi IPv4 Policy yang tepat pada perangkat Firewall Fortigate diharapkan akan menciptakan kinerja jaringan yang optimal dan efisien dengan nilai parameter QoL yang memenuhi standar kualitas yang telah ditentukan.

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Security in the field of information and technology have become so much more important than ever, especially for the important of company 39 s performance. Network security should run optimally so as not to burden the performances of other works. There has to be a lot of efforts being put to improve network security and its performance. Fortigate Firewall as a network security and network management devie is to be configured with utmost importancy and optimicy to reach its maximum potential to be an efficient network device. IPv4 Policy on Fortigate 39 s own implementation is a very important aspect for the device performance in securing and optimizing the network performance. Optimization on IPv4 Policy of Fortigate Firewall device is likely to become an important thing to improve the quality of network, such that the QoL parameters with good quality and desiganted standards."

"This book constitutes the refereed proceedings of the 10th International Conference on Applied Cryptography and Network Security, ACNS 2012, held in Singapore, in June 2012.The 33 revised full papers included in this volume were carefully reviewed and selected from 192 submissions. They are organized in topical sessions on authentication, key management, block ciphers, identity-based cryptography, cryptographic primitives, cryptanalysis, side channel attacks, network security, Web security, security and privacy in social networks, security and privacy in RFID systems, security and privacy in cloud systems, and security and privacy in smart grids."

"Intrusion Detectio System (IDS) merupakan sistem yang dapat mendeteksi adanya intrusi atau gangguan pada suatu jaringan atau sistem informasi. Salah satu jenis IDS adalah anomaly detection di mana suatu data trafik jaringan akan dikatakan intrusi apabila mempunyai karakteristik yang berbeda dari kebanyakan data lainnya. Anomaly detection dapat mendeteksi serangan dalam host atau network yang menyimpang dari aktivitas normal berdasarkan probabilitas statistika. Statistical anomaly detection tidak memiliki model intelligent learning yang mungkin menyebaban false alarm memiliki tingkat deteksi tinggi. Metode yang digunakan sistem adalah Bayesian Network TAN Classifier. CI Test merupakan salah satu algoritma yang handal untuk membangun model TAN Classifier untuk klasifikasi. Dengan representasi grafis gabungan dari probabilitas fungsi distribusi lebih dari satu set variabel. "

"Keamanan pada suatu sistem jaringan perusahaan sangatlah diperlukan. Tingkat availability yang tinggi di suatu server perusahaan menjadi aset berharga untuk mencapai profit perusahaan tersebut. Gangguan jaringan yang dialami perusahaan akan berdampak ke seluruh stakeholder perusahaan. Keamanan yang dilakukan menggunakan aplikasi firewall dinilai belum cukup untuk melindungi jaringan perusahaan. Penggunaan IDS pada suatu jaringan juga membutuhkan keahlian khusus dari administrator untuk terus menerus dapat memantau keamanan jaringan. Agar dapat melakukan pemantauan yang efektif dan hemat tenaga maka dilakukan penelitian untuk mendeteksi intrusi pada suatu keamanan jaringan dan melakukan reporting dengan menggunakan suatu bot Telegram. Penggunaan bot Telegram ini diharapkan akan memberikan suatu sistem reporting otomatis yang menyederhanakan proses monitoring pada suatu kegiatan berulang agar informasi terhadap serangan dari luar akan lebih cepat terdeteksi. Peringatan bahaya dikirim berupa notifikasi yang diintegrasikan pada aplikasi Telegram baik melalui smartphone maupun PC dengan berbentuk log alert yang dapat menampilkan waktu kejadian, IP yang diserang, IP attacker dan jenis serangan yang dilakukan. Dengan melakukan implementasi monitoring secara realtime terhadap jaringan melalui telegram maka baik pihak “IT” maupun “non IT” akan dapat mendapat informasi terhadap intrusi tersebut agar dapat melakukan reporting secara cepat.

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Corporate network system security is very important. A high level of availability on a company's server becomes a valuable asset to achieve the company's profit. Server or network disruptions experienced by the company will affect all stakeholders of the company. Security measure carried out using a firewall application is not enough to protect corporate networks. The use of IDS on a network also requires special expertise from the administrator to continuously be able to monitor network security. In order to be able to carry out effective and energy-efficient monitoring, a study was conducted to detect intrusion in a network security and report it using a Telegram bot. The use of this Telegram bot is expected to provide an automatic reporting system that simplifies the process of monitoring a recurring activity so that information on attacks from outside will be responded more quickly. Danger alerts are sent in the form of messages that are integrated into Telegram applications both via smartphones and PCs in the form of log alerts that can display the time of occurrence, server IP being attacked, IP attacker and type of attack carried out. By implementing real-time monitoring of the network via telegram, both "IT" and "non-IT" parties will be able to obtain information on the intrusion so that they can make fast responses."

"This book constitutes the refereed proceedings of the International Conference on Recent Trends in Computer Networks and Distributed Systems Security, held in Trivandrum, India, in October 2012. The 34 revised full papers and 8 poster presentations were carefully reviewed and selected from 112 submissions. The papers cover various topics in Computer Networks and Distributed Systems."

"This book constitutes the refereed proceedings of the 16th International Conference on Secure IT Systems, NordSec 2011, held in Tallinn, Estonia, October 26-28, 2011. The 16 revised papers presented together with 2 invited talks were carefully reviewed and selected from 51 submissions. The papers are organized in topical sections on applied cryptography, commercial security policies and their enforcement, communication and network security, security modeling and metrics, economics, law and social aspects of security, and software security and malware."