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Password generation and password management are the most important factors in information security. Hence, this study measures the degree of inclusion of information that is identical or similar to personal information among the passwords generated by teenagers. It is reported that for each teenager there are approximately 3.3 passwords and the number of passwords that need to be managed by individuals is constantly increasing due to rapid expansion of the Internet of Things. The results of this study showed that, of the student generated passwords, 40% are similar to their IDs and 70% are consistent with their personal information. Out of these, 67.5% of the respondents stated that they did not periodically change their passwords. It also indicated that 87.5% of the passwords consist of both characters and numbers, which are a general characteristics of passwords generated by the people in Korea, and only 1.1% of the passwords include special characters. It was also found that 32.2% of the students experience hacking incidents, of which 53.7% of the incidents occur in games and 34.5% in portal sites; this implies that students become victims of hacking in cyber space that they use frequently. However, information security education in school does not provide detailed information on passwords, thus requiring urgent improvement.