It is important to be aware that there are certain types of online threats that will cause a whole lot of problems such as data loss and reprogramming the computer system. Therefore, online security has become an enormous concern when surfing the net. Nowadays, computer users are facing the threats of cyber crime, phishing, internet and network attacks such as computer viruses, worms and Trojan horses and back doors. 
1) Viruses Virus is a piece of software code that inserts itself into a host, including the operations systems. The virus is activated once its host program be executed and attempts to copy itself into more program. Viruses may simply infect and spread; others do substantial damage such as deleting files or corrupting the hard drive. For example, "I LOVE YOU" virus caused over $100 million
2) Worms Worm is a self-replicating software program, consuming the resources of its host in order to maintain its capable of propagating a complete working version of itself onto another machine. It uses networks to spread itself or spread through instant messages; it does infect a computer or hand held device without human intervention. Macro virus or macro worm is executed when the application object that contains the macro is opened or a particular procedure is executed.
3)Trojan horsesA program that appears to have useful function but contains a hidden function which presents a security risk is known as Trojan horse. Trojan horse is unlike a worm, it requires user cooperation. Once on your machine, Trojans then function as independent programs that operate secretly. Commonly, Trojans steal passwords or perform "denial of service" attacks. Examples of Trojans include Backdoor and Nucker.
1 comments on "The threat of online security"
hmm...really need to be aware every seconds when we surfing internet, especially downloading sumthing...trojan horses is the virus i met frequently..fortunately, the anti-virus i'm using now can very fast detect virus, so that i can deny access to those files..
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