What is hacking?
Hacking is an act of penetrating computer systems to gain knowledge about the system and how it works.
What are Hackers?
Technically, a hacker is someone who is enthusiastic about computer programming and all things relating to the technical workings of a computer. Under such a definition, I would gladly brand myself a hacker. However, most people understand a hacker to be what is more accurately known as a 'cracker'
What are Crackers?
Crackers are people who try to gain unauthorized access to computers. This is normally done through the use of a 'backdoor' program installed on your machine. A lot of crackers also try to gain access to resources through the use of password cracking software, which tries billions of passwords to find the correct one for accessing a computer.
What damage can a Hacker do?
This depends upon what backdoor program(s) are hiding on your PC. Different programs can do different amounts of damage. However, most allow a hacker to smuggle another program onto your PC. This means that if a hacker can't do something using the backdoor program, he can easily put something else onto your computer that can. Hackers can see everything you are doing, and can access any file on your disk. Hackers can write new files, delete files, edit files, and do practically anything to a file that could be done to a file. A hacker could install several programs on to your system without your knowledge. Such programs could also be used to steal personal information such as passwords and credit card information
How do Hackers hack?
There are many ways in which a hacker can hack. Some are as follows –
* ICMP Ping
NetBIOS hacks are the worst kind, since they don't require you to have any hidden backdoor program running on your computer. This kind of hack exploits a bug in Windows 9x. NetBIOS is meant to be used on local area networks, so machines on that network can share information. Unfortunately, the bug is that NetBIOS can also be used across the Internet - so a hacker can access your machine remotely.
ICMP ‘Ping’ (Internet Control Message Protocol)
ICMP is one of the main protocols that make the Internet work. It standards for Internet Control Message Protocol. 'Ping' is one of the commands that can be sent to a computer using ICMP. Ordinarily, a computer would respond to this ping, telling the sender that the computer does exist. This is all pings are meant to do. Pings may seem harmless enough, but a large number of pings can make a Denial-of-Service attack, which overloads a computer. Also, hackers can use pings to see if a computer exists and does not have a firewall (firewalls can block pings). If a computer responds to a ping, then the hacker could then launch a more serious form of attack against a computer.
FTP (File Transfer Protocol)
FTP is a standard Internet protocol, standing for File Transfer Protocol. You may use it for file downloads from some websites. If you have a web page of your own, you may use FTP to upload it from your home computer to the web server. However, FTP can also be used by some hackers... FTP normally requires some form of authentication for access to private files, or for writing to files
FTP backdoor programs, such as-
* Doly Trojan
* Blade Runner
simply turn your computer into an FTP server, without any authentication.