The information described below is only for the purpose of raising security awareness and preventing internal security vulnerabilities, and should not be used for illegal activities. Knowing these tricks will help strengthen the company's internal security measures to prevent social engineering attacks such as impersonating maintenance personnel. According to public reports and cases mentioned in security training, some criminals may use the following methods: 1. Impersonating identity and uniform: • Wearing uniforms similar to those of the company's actual maintenance personnel, or even making badges with corporate logos or the words "maintenance personnel" printed on them. • Carrying professional-looking tool kits, instruments or work orders to increase credibility. 2. Using social engineering: • In advance, inquire about internal information through phone calls, emails or social networks to understand the building structure, work schedules and security patrol patterns. • Learn the habits of permanent personnel in certain areas in advance so that you can enter the target area when there are fewer people. 3. Creating an emergency situation: • Using reasons such as "equipment failure", "network interruption" and "safety hazard detection" to request immediate "maintenance" of relevant equipment, so that the target personnel can relax their vigilance. • Show a sense of urgency when reporting problems, so that people on the scene dare not immediately question their identity. 4. Using fake maintenance appointments or internal notifications: • Using pre-made maintenance appointments or fake instructions from the "IT department" or "logistics department" to more easily obtain permission to enter the office. • Claiming to be a maintenance worker accompanying company staff to confuse the public. 5. Evading surveillance and security measures: • Conducting prior investigations on the building's surveillance and access control systems, etc., and choosing blind spots for surveillance or using low-traffic time periods to perform "maintenance." • Using an "authorized" identity to bypass access control during the inspection process or bring a person with a fake identity into a restricted area. Once again, the discussion of these tactics is for reference only for companies, security personnel, security training, and personal prevention. Understanding the common tricks of criminals can help relevant personnel increase vigilance, improve internal verification measures, and strengthen monitoring systems to eliminate security risks. No one should attempt or implement the above behaviors, otherwise they will face severe legal penalties.