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  1. Proceedings of the 4th ACM Workshop on Security and Privacy in Smartphones & Mobile Devices (SPSM '14)
  2. Analysis of Secure Key Storage Solutions on Android
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Analysis of Secure Key Storage Solutions on Android

Content Provider ACM Digital Library
Author de Ruiter, Joeri Cooijmans, Tim Poll, Erik
Abstract Mobile phones are increasingly used for security sensitive activities such as online banking or mobile payments. This usually involves some cryptographic operations, and therefore introduces the problem of securely storing the corresponding keys on the phone. In this paper we evaluate the security provided by various options for secure storage of key material on Android, using either Android's service for key storage or the key storage solution in the Bouncy Castle library. The security provided by the key storage service of the Android OS depends on the actual phone, as it may or may not make use of ARM TrustZone features. Therefore we investigate this for different models of phones. We find that the hardware-backed version of the Android OS service does offer device binding -- i.e. keys cannot be exported from the device -- though they could be used by any attacker with root access. This last limitation is not surprising, as it is a fundamental limitation of any secure storage service offered from the TrustZone's secure world to the insecure world. Still, some of Android's documentation is a bit misleading here. Somewhat to our surprise, we find that in some respects the software-only solution of Bouncy Castle is stronger than the Android OS service using TrustZone's capabilities, in that it can incorporate a user-supplied password to secure access to keys and thus guarantee user consent.
Starting Page 11
Ending Page 20
Page Count 10
File Format PDF
ISBN 9781450331555
DOI 10.1145/2666620.2666627
Language English
Publisher Association for Computing Machinery (ACM)
Publisher Date 2014-11-07
Publisher Place New York
Access Restriction Subscribed
Subject Keyword Trusted computing Key storage Tee Trustzone Android
Content Type Text
Resource Type Article
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