DoS (Denial of Service) – the sense of an attack is in the incapacitation of the victim’s computer. The principle of operation is in “throwing” the victim by unnecessary information. At sufficiently high intensity it can be derived targeted computer from the network. It is also possible combined method for sending a flow of information with malicious code on a vulnerable application.
DoS attack is often not effective enough and has sense only when the transmission speed of the cracker exceeds the possibility of receiving casualties at times. DDoS attack – is a type of DoS – attack. DDoS attack is different only that it uses not one computer hacker, but much more. It is often used specific viruses which are waiting for orders to attack after infection.
~ 2000 computers can damage the small Internet server.
To protect from DDoS attack is almost impossible.
Trojan.
Trojan in some extent is a type of network attack too. You are made run it on your computer system in any way make you and then get access to the remote system.
Sometimes after a successful hack of the system hackers leave Trojan, in case if they need to regain access to this system.
Joke programs undertaken by a virus (trojan).
1. Self-nominated CD-ROM – the host of Trojan manages putting forward (Reason: Trojan “Death Lamer and other types).
2. Suddenly, the screen display the picture “fist”, while you’re at a time write another poem … (Trojan – Death Lamer and other types).
3. Suddenly there is the sound of roaring cow in the columns (Association of hackers USA, in other words, the Trojans Bekorifes – Cult of the Dead Cow).
4. You cannot start something from taskbar and in general it stopped to be available – the Trojans.
5. The disappearance from taskbar (gray bars at the bottom of the screen – the task bar) the icons of protection (reason: you delete the program, in particular Antivirus, which you have not updated).
6. When testing a computer for viruses, your antivirus give an error (plate) with a message that you have some sort of a mistake, but in the end says that everything is ok (the reason: You cut out the library on the Trojans in the antivirus, the result – antivirus is running, but it does not see the Trojans at all).
7. You receive by mail that you write in solitude (ways are different), the most sophisticated – they have stolen your screen (screenshot) and seen what you have written and whom, and in general how your desktop looks like…
And the last – never trust the icons of the downloaded program. If downloaded program with the white icon – it is the first sign that it is «left.” Also do not trust the icons of your existing programs. There are programs, for example, Michelangelo, which allow you to assign any program (Trojan Horses in particular) any icon. And especially look at an extension after the name and what they are facing, because the point that you see may be the usual comma, it means that the file name is the continuation and expansion of its real far behind.
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