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Data Protection for Computer Forensics using Cryptographic Mechanisms |
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PP: 989-1001 |
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Author(s) |
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Tzong-Sun Wu,
Han-Yu Lin,
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Abstract |
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| Data protection is an important issue for computer forensics in a digitalized world. We construct secure data protection
methods by adopting cryptographic building blocks. In our proposed scheme, an investigating authority delegates a group composed
of n judicial policemen to collect digital evidence. Any t or more of them can cooperatively generate valid authenticated evidence for
collected ordinary evidence on behalf of the investigating authority. To ensure confidentiality, the authenticated evidence can only be
decrypted and verified by a designated investigator of Investigation of Bureau, Ministry of Justice (MJIB). For the litigation process,
the designated investigator is capable of further converting the authenticated evidence into an ordinary one and giving it to a judge
or prosecutor without leaking the information of his private key. We also present a variant with message linkages for benefiting the
encryption of a large message. To guarantee the feasibility of practical implementation, we show that our construction achieves the
IND-CCA2 and the EF-CMA security in the random oracle model. |
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