Social engineering is one of the crimes. This crime also called social hacking or social cracking. This crime is that people get a password or important information by social ways. The examples of social ways are tap, pirating or art of conversation. Nowadays, we can watch much news about ore-ore fraud in Japan. This crime is that people try to call older people, and the people pretend to be a son or grandchild. The fraud requires money for older person. Many older person was deceived the fraud. In conclusion, the key point of social engineering is a people. Many information leakages are by the people’s fault. We depends computer in many situations. If people have many faults, the computer’s securities are not working. Therefore, I think that we can prevent the crime of social engineering