Encrypted file retrieval method and device and computer-readable recording medium
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jan 8, 2008
Grant Date -
Mar 28, 2002
app pub date -
Sep 26, 2001
filing date -
Sep 28, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An encrypted file is constituted by an assemblage of records having a plurality of items, and at least key items among the plurality of items that are keys in a retrieval are encrypted. The expansion means of a retrieval device decrypts at least key items of each record of the encrypted file, attaches identifiers that indicate which records the key items belong to, and expands the decrypted key items and identifiers in a work area of a main memory. A retrieval means retrieves from the work area key items that satisfy retrieval conditions that are applied by the user, reads the appropriate original records from the encrypted file if retrieval succeeds, decrypts the records, and presents them to the user.
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