Trojan horses carry viruses or worms

Wednesday, July 29, 2009

Trojan horses can carry viruses or worms because they can have a payload that installs a back door or trap door component in a computer which allows attacker to access computer when they needed. Trojan horses are medium threats to computers. when computers are infected with Trojan horse then that computer became very slow because behind the system that Trojan horse do huge amount of work such as searching important information, stealing information from the system an so on.

The most common types of Malware and difference between worms and viruses

The most common type of malware are viruses, worms, Trojan horse, logic bombs, and back doors. Worm is a malicious program which do not require another program for replication. It can replicate themselves as long as the memory, hard disk space and network bandwidth is available. If our system is infected with worm then every website we visit are also affected by it because it places working copies of worm on their servers.
Whereas viruses itself cannot do anything it needs application program to transmit the virus from one machine to another. So it attaches itself to the program and take control of that programs to target computer. Then virus controlled computers starts to replicate itself to target other computers.

Buffer overflow attack and denial of service attack

Buffer overflow attack is application error when more data is sent to a buffer then it can handle. This time attacker will take the opportunity and attack the system by sending lots of request which leads to denial-of-service attack. Then the web page will no longer be available to users.
When denial-of-service attack occurs then every system connected to the internet which provide TCP based network services such as web server, FTP server are affected by it.

Internet and its Features

Monday, July 27, 2009

Today's world is the age of information technology age. today people do lots of work without spending lots of time and energy. They sit in home and complete lots of work such as do shopping, pay their phone bill, Rent etc online without going outside. For this they need internet and computer at their home.

well it has lots of advantage as well as it has disadvantages as well. when we use internet then sometime we are being hacked by other computer secretly, so we must have to install updated anti-virus and firewall to protect our computer. These are some security measures to be taken very seriously because sometime hacker may hack our computer and get very secret information such as our email user name and password, Bank account details and our personal photos etc.
so in order to protect from these hackers we need to install updated anti-viruses and firewall.

Some of the features we can get by internet are, we can shop our groceries online and delivered to our home. we can pay different bills such as grocery bill, phone bill, Internet Bank transfer etc.