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Nikkei Network

May 2006 Issue

FEATURE 1 How Does Information Leakage Occur via Winny? Thorough Examination of Winny & “Exposure” Viruses - Winny P2P file-sharing software has drawn a lot of attention due to a series of information leakage incidents caused by using it.  How does information leakage occur via Winny?  What can we do to prevent the software from causing damages? This article thoroughly examines Winny and the mechanism of viruses that reveal information by exploiting the software and provides answers to these questions. Introduction: Information leakage incidents cannot be prevented without understanding the essence of the problem Part 1: Winny – Copies of leaked information proliferate across the Web, and once the copies are leaked onto the Internet, the proliferation cannot be stopped Part 2: Exposure Viruses – If an infected file is not opened, the viruses cannot infect the computer; Changes in the configuration of email software enable users to detect infected files Part 3: Measures – The key is to restrict PC users from using Winny, and there are two ways to prevent the execution of the software

BEGINNERS’ QUESTIONS

Is it true that massive P2P traffic will be restricted?

FEATURE 2

Diagnosis of Networks
Let’s Measure Throughput

- It can be assumed that anyone who uses a network may want to measure the performance of the network which he or she uses.  There are a number of websites and tools which can be used to measure the performance of a network.  
Therefore, it is not so difficult to measure its performance.  If you measure the performance of a network repeatedly by changing conditions or tools, unexpected bottlenecks may emerge.
This article allows readers to understand the mechanism of the measurement and to actually measure networks that they are using.


Prologue: Measuring the performance of a network is unexpectedly interesting; let’s check your network’s performance

Part 1: Measurement – The performance of a network can be measured easily by using websites and tools; if you understand the mechanism, you can know what the results of a measurement indicate

Part 2: Analysis – Measured values are not consistent because the background of the measurement is complex; there are three places in which a bottleneck is likely to occur

Experiment: Which is faster, TCP or UDP?