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Erschienen in:
2015 | OriginalPaper | Buchkapitel
Security Improvement of Portable Key Management Using a Mobile Phone
verfasst von : Jiye Kim, Donghoon Lee, Younsung Choi, Youngsook Lee, Dongho Won
Erschienen in: Computational Science and Its Applications -- ICCSA 2015
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Users often store sensitive information on their laptops, but it can be easily exposed to others if a laptop is lost or stolen. File encryption is a common solution to prevent the leakage of data from lost or stolen devices. For the management of strategies like this, key management is very important to protect the decryption key from attacks. Huang et al. proposed a portable key management scheme, whereby a laptop shares secret values with a mobile phone. Their scheme is convenient as well as practical because it is not reliant on a special device or password input. However, we found that it is still vulnerable to an attack if a laptop is stolen. In this paper, we analyse the security of Huang et al.’s scheme and propose a solution to the outstanding vulnerability. Our proposed scheme exploits two types of keys including a one-time symmetric key to protect the file decryption key. Additionally, the security improvement does not compromise the convenience of the portable key management scheme.