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    Gowri: Different Threats to computer are:
                     1.  Virus:  Computer viruses are nothing but computer programs that do unwanted things with
                        your computer resources. For example, you are working on PC and you are repeatedly receiving
                        annoying message.
                     2.  Worms:  Worms  are self-replicating viruses and consume the  system
                        resources.
                     3.  Trojan  Horse: A Trojan horse is simply a computer program. It is like
                        a program that claims to be a reliable program such as being a game but
                        instead causes damage when you run it like it may erase your hard disk.
                        Trojan horses do not replicate automatically.
                     4.  Spyware: Spyware is a software program that secretly gathers personal
                        information and sends it without the user's knowledge while the computer
                        is online.
                     5.  Phishing: Phishing is an attempt to acquire sensitive information such as
                        username, password or credit card details.
                     6.  Pharming: Pharming is an attack in which a hacker attempts to redirect a website’s  traffic to
                        another fake website.

                        Aryan: How can I know if my computer has a virus?

                        Gowri: There are some symptoms of computer virus.
                                                     Symptoms of a Computer Virus

                                                                 The computer
                                                               crashes and then
                                   The computer                     restarts
                                  runs slower than                 frequently.
                                        usual.                                               Applications on the
                                                                                              computer do not
                                                                                               work correctly.

                            Disks & disk
                             drives are
                            inaccessible.

                                                                                                   New icons or
                                                                                              shortcuts will appear
                                                                                              on the screen or disk
                                  You see                                                             drives.
                               unusual error
                                 messages.                    Antivirus programs
                                                             cannot be installed on
                                                           the computer or antivirus
                                                                 will not work.

                                                                     Fig. 7.1

                                                                                 Computer Security                      71

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