CYBER SECURITY STRATEGY OF MONTENEGRO 2018-2021 may be used legitimately by a sender to replace their mobile number with their own name, or company name, for instance. Or it may be used illegitimately, for example, to fraudulently impersonate another person. Social engineering The methods attackers use to deceive and manipulate victims into performing an action or divulging confidential information. Typically, such actions include opening a malicious webpage, or running an unwanted file attachment. User A person, organisation entity, or automated process, that accesses a system, whether authorised to, or not. Virus Viruses are malicious computer programs that can spread to other files. Vulnerability Bugs in software programs that have the potential to be exploited by attackers. 43