IP stands for "Internet Protocol". It can be thought of as the common language of computers on the Internet. There are a number of detailed descriptions of IP given elsewhere, so we won't cover it in detail in this document. However, it is important to know a few things about IP in order to understand how to secure your computer. Here we’ll cover IP addresses, static vs. dynamic addressing, NAT, and TCP and UDP Ports.
WHAT IS AN IP ADDRESS?
IP addresses are analogous to telephone numbers – when you want to call someone on the telephone, you must first know their telephone number. Similarly, when a computer on the Internet needs to send data to another computer, it must first know its IP address. IP addresses are typically shown as four numbers separated by decimal points, or “dots”. For example, 10.24.254.3 and 192.168.62.231 are IP addresses.If you need to make a telephone call but you only know the person’s name, you can look them up in the telephone directory (or call directory services) to get their telephone number. On the Internet, that directory is called the Domain Name System, or DNS for short. If you know the name of a server, say www.cert.org, and you type this into your web browser, your computer will then go ask its DNS server what the numeric IP address is that is associated with that name.
Every computer on the Internet has an IP address associated with it that uniquely identifies it. However, that address may change over time, especially if the computer is dialing into an Internet Service Provider (ISP) connected behind a network firewall connected to a broadband service using dynamic IP addressing.
WHY COMPUTER SECURITY?
We use computers for everything from banking and investing to shopping and communicating with others through email or chat programs. Although you may not consider your communications "top secret," you probably do not want strangers reading your email, using your computer to attack other systems, sending forged email from your computer, or examining personal information stored on your computer (such as financial statements).
WAYS HOW HACKERS BREECH SECURITY?
1. Stealing Passwords
2.Trojan Horses
3. Exploiting Defaults
4. Man-in-the-Middle Attacks
5.Wireless Attacks
6. Monitoring Vulnerability Research
For full information download this handbook.
INVISIBILITY CLOAK
Posted by Dave Enoch On May - 02 - 2009Would'nt that be amazing to be invisible. The scientists have kept a step forward and made a cloak which is called an invisibility cloak which neither absorbs nor reflects light making the body invisible. This can lead to invisible suits which are going to be available in the market but may be expensive at the start.
FIRST PLASMA TRANSISTOR
Posted by Dave Enoch On May - 02 - 2009Scientists finally fabricate the first plasma transistor.Though this is not good enough to be used in the commercial systems but this has made a path to use them in future.
In the plasma transistor, the electron emitter injects electrons in a controlled manner into the sheath of a partially ionized neon gas (the plasma). The scientists discovered that even a voltage as low as 5 volts can change the properties of the microplasma, including quadrupling the current and increasing the visible light emission.
500GB Optical Disc
Posted by David On May - 02 - 2009The storage capacity of micro-holographic discs that the normal DVDs or the blue-ray discs because the micro-holographic discs store information in a 3D way rather than just putting it onto the surface of the disc.
G.E(General Electrics) has made dramatic changes in the material to increase the reflectivity of the surface.If the reflectivity of the surface increases then the amount of information that can stored automatically increases.
NANO-CLOTH NEVER GETS WET
Posted by David On May - 02 - 2009If you were to soak even your best raincoat underwater for two months it would be wet through at the end of the experience. But a new waterproof material developed by Swiss chemists would be as dry as the day it went in.
Lead researcher Stefan Seeger at the University of Zurich says the fabric, made from polyester fibres coated with millions of tiny silicone filaments, is the most water-repellent clothing-appropriate material ever created.
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