**3.2 Background knowledge attacks**

Background knowledge is non-sensitive information that can be obtained from data published by different organizations, social networks and media even by using social engineering methods. Background knowledge obtained by attacker's causes privacy attacks and breaches.

Data subject's privacy violation occurs as a result of associating background knowledge with other records using data binding methods [41].

In addition, when information obtained from data owners through requests such as promotion, campaign, research, etc. is associated with background information, it is not even possible that it will not cause a violation of privacy.
