Social engineering is the acquisition of information, or edicts, secret / sensitive by cheating the owner of such information. Social engineering is typically done via telephone or Internet. Social engineering is one of the methods used by hackers to gain information about the target, by requesting the information directly to the victim or others who have that information.
Social engineering concentrates on the weakest chain of computer network systems, namely humans. As we know, no computer system that does not involve human interaction. And worse, this vulnerability is universal, independent of platforms, operating systems, protocols, software or hardware. That is, each system has the same weakness in human factors. Any person who has physical access to the system is a threat, even if the person is not included in the security policy that had been developed. Other methods such as hacking, social engineering also requires preparation, even most of the work includes the preparation itself.