In crime literature, characters often use a variety of social engineering techniques to get sensitive information from security guards. Here are some common techniques: 1. **Disguise**: A character may pretend to be a maintenance worker, IT technician, or other person who is believed to have access to sensitive information in order to gain trust. 2. **Emergency**: A character may create an emergency situation so that the security guard will reveal sensitive information in the chaos. For example, a false system failure needs to be repaired urgently. 3. **Sympathy strategy**: A character may make up a story about personal difficulties to gain the sympathy and trust of the security guard, so that the other party will let down their guard. 4. **Reciprocity principle**: A character may give a security guard a small gift or other favor to establish an informal reciprocal relationship so that the other party feels obligated to help. 5. **Social verification**: Pretend to be a friend or colleague of other trustworthy people to establish trust by citing common acquaintances or events. 6. **Information fishing**: Use conversational techniques to lead the security guard to inadvertently reveal key information. For example, use open-ended questions to gradually approach details. 7. **Intimidation**: In some plots, characters may use psychological intimidation to make security guards succumb under pressure and provide necessary information. 8. **Playing to their interests**: By observing and understanding the interests and hobbies of security guards, characters may use this information to establish relationships and exchange information. These strategies are often used in the plot to highlight the cunning and complexity of the characters, and also reflect some real methods of social engineering in real life.