Sybil Attack as the name suggests means forging of multiple identities for malicious intent named after the famous multiple personality disorder patient "Sybil" (Shirley Ardell Mason).This particular attack has been used by spammers to create multiple websites with identical domain names with junk and gibberish content. These pages have no quality content and are created just with the intention to create spam and drive traffic. All these webpages are then interlinked to each other in order to boost their search engine traffic. In Sybil attack each node can be referred to as a separate webpage that the spammer creates, and each of these webpages (nodes) interlink to each other thus forming a network similar to link farms or domain farms. The spoilt nodes (spammy webpages) link to other nodes (through text links) and thus create a huge link farm.
The term "Sybil attack" is used for this particular tactic of spammers as it resembles the name of the multiple personality disorder disease with creation of multiple webpages with different domains by spammers.
Sybil attack is a black hat SEO manipulation where a spammer takes over the reputation systems of various networks like forums, blogs, social networking sites etc. They create multiple identities using each one of these networks in order to improve the reputation of the main ID. With this reputation they post 'n' number of ads and posts hoping that they don't get noticed. A spammer may also create Sybil attack by creating a lot of sites that link to each other. These sites may be pure spam blogs or irrelevant pages with low quality content.
Using Sybil attack to manipulate the search engine is very rare but still there are spammers who use such tactics to gain traffic to their sites. Search engines are trying to take action towards such attacks.
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The above image is a description of Sybil attack which shows Sybil nodes (multiple webpages created by spammers) that attack the normal nodes (other websites).
The image above shows how spammers create multiple webpages with identical domain names. All these webpages are also interlinked to each other in order to create search engine traffic. Sybil attack is an example of black hat SEO manipulation.
Example of Sybil attack where spammer creates multiple domains to cross link them and spam the search engines.
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