Abstract
The majority of mobile apps use credentials to provide an automatic login function. Credentials are security tokens based on a user's ID and password information. They are created for initial authentication, and this credential authentication then replaces user verification. However, because the credential management of most Android apps is currently very insecure, the duplication and use of another user's credentials would allow an attacker to view personal information stored on the server. Therefore, in this paper, we analyze the vulnerability of some major mobile SNS apps to credential duplication that would enable access to personal information. To address the identified weaknesses, we propose a secure credential management scheme. The proposed scheme first differentiates the credential from the smart device using an external device. Using a security mechanism, the credential is then linked with the smart device. This ensures that the credential will be verified by the special smart device. Furthermore, based on experimental results using a prototype security mechanism, the proposed scheme is shown to be a very useful solution because of its minimal additional overhead.
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