Encrypted file system, encrypted file retrieval method, and computer-readable medium
First Claim
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1. An encrypted file system, comprising:
- a file for storing records wherein at least a key item among a plurality of items that is a key during retrieval is encrypted, and wherein an encryption of key items is realized by encrypting data of the key items in character units and then combining; and
a retrieval device for performing retrieval from said file using an encrypted retrieval key wherein a retrieval key that is provided as a retrieval condition has been encrypted in character units and then combined.
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Abstract
A registration device registers, in an encrypted file, records in which at a least key item among a plurality of items that is a key during a retrieval is encrypted. At this time, the registration device generates encrypted data of entire key items by encrypting the data of key items in character units and then combining. The retrieval device executes a complete-match and partial match retrieval from the encrypted file using an encrypted retrieval key in which a retrieval key that has been given as a retrieval condition has been encrypted in character units and then combined.
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Citations
38 Claims
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1. An encrypted file system, comprising:
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a file for storing records wherein at least a key item among a plurality of items that is a key during retrieval is encrypted, and wherein an encryption of key items is realized by encrypting data of the key items in character units and then combining; and
a retrieval device for performing retrieval from said file using an encrypted retrieval key wherein a retrieval key that is provided as a retrieval condition has been encrypted in character units and then combined. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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19. An encrypted file retrieval method, comprising the steps of:
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(a) performing encryption of key items by encrypting data of the key items in character units and then combining, this step being a step for registering, in a file, records in which at least a key item among a plurality of items that is a key in a retrieval is encrypted; and
(b) performing retrieval from said file using an encrypted retrieval key in which a retrieval key that is given as a retrieval condition has been encrypted in character units and then combined.
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31. A recording medium that can be read by a computer in which is recorded a program for causing a computer to function as:
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a registration device that is a means for registering, in a file, records in which at least a key item among a plurality of items that is a key in a retrieval is encrypted, and for performing encryption of key items by encrypting data of the key items in character units and then combining; and
a retrieval device for performing retrieval from said file using an encrypted retrieval key wherein a retrieval key that is provided as a retrieval condition has been encrypted in character units and then combined. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38)
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Specification