METHOD AND APPARATUS FOR CIPHERTEXT INDEXING AND SEARCHING
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United States of America Patent
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N/A
Issued Date -
Jul 1, 2010
app pub date -
Dec 11, 2009
filing date -
Dec 30, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention provides a method and apparatus for ciphertext indexing and searching. Indices of multiple levels are created for the encrypted files. Each item in the primary index includes a primary index item identifier and the ciphertext of the primary indexing information of the related file. The primary indexing information each includes an identifier(s) of the related secondary index item identifier(s) and the corresponding decryption information. Each item in the secondary index includes a secondary index item identifier and the ciphertext of the secondary indexing information. Information necessary for obtaining a file is included in the corresponding secondary indexing information. With the decryption information of the secondary indexing information in the decrypted primary indexing information, the ciphertext of the related secondary indexing information is decrypted so as to obtain information such as the decryption key of the file.
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