Home computers are frequently the target of malicious attackers because they are usually administered by non-experts. Prior work has found that users who make security decisions about their home computers often possess different mental models of information security threats, and use those mental models to make decisions about security. Using a survey, we asked a large representative sample of United States Internet users about different causal beliefs related to computer security, and about the actions they regularly undertake to protect their computers. We found demographic differences in both beliefs about security and security behaviors that pose challenges for helping users become more informed about security. Many participants reported weakly held beliefs about viruses and hackers, and these were the least likely to say they take protective actions. These results suggest that all security knowledge is not the same, educating users about security is not simply a more-is-better issue, and not all users should receive the same messages.

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