Patent
Method for generating and retrieving index of encrypted document and encrypted document retrieval system
TLDR
In this paper, the authors proposed a safe method to generate an index of an encrypted document by using unidirectional function operation to convert the bit string of the cipher into a certain length, and turning on a bit position corresponding to each value to register an index value.Abstract:
PROBLEM TO BE SOLVED: To further accelerate retrieval processing while improving secrecy by generating an index of an encrypted document by a safe method. SOLUTION: A user terminal (terminal apparatus) 12 captures the input of a word to be registered as an index value, encrypts the word, converts the cipher into a certain value by applying unidirectional function operation to convert the bit string of the cipher into a certain length, and turns on a bit position corresponding to each value to register an index value. A data center (center apparatus) 20 generates an index tree by grouping and hierarchically arranging similar indexes out of registered indexes, and when an encrypted retrieval keyword is received, compares the index of the received retrieval keyword with the index tree to determine the existence of a retrieval key. COPYRIGHT: (C)2007,JPO&INPITread more
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Patent
Confidential search system and cryptographic processing system
TL;DR: In this paper, the inner product of an attribute vector and a predicate vector is a predetermined value, and the confidential search system conducts pairing computation of decrypted data generated based on the attribute vectors and a decryption key based on predicate vectors, so as to realize confidential search by utilizing an inner-product predicate encryption process that can decrypt the encrypted data.
Patent
Data search device, data search method, data search program, data registration device, data registration method, data registration program and information processing device
TL;DR: In this paper, a data search server 300 stores a system ciphertext 230 including a data ciphertext and a keyword ciphertext in each category specific DB unit 391 for each data category, and stores each category-determination secret key 153 being associated with each database unit.
Patent
Secure search method and secure search device
Yasuhiro Fujii,Susumu Serita +1 more
TL;DR: In search that uses searchable code, the search query and the secure index are collated in round-robins fashion, registering the required secure index and a characteristic quantity of deposited data in a database server as discussed by the authors.
Patent
Data processing apparatus and data storage apparatus
TL;DR: In this paper, a group determination key is used to decrypt group information generated from a keyword of storage target data and having been encrypted to the data center apparatus, with encrypted data relating it to the tag data, decrypts a part of the grouping information with the group determination, derives an index value from a bit value obtained by the decryption, and stores the derived index value and the tags relating them with each other.
Patent
System and method for secure use of messaging systems
TL;DR: In this article, a mediator may receive an original message, process the original message to produce a processed message, and may forward the processed message to a server or a messaging system.
References
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Patent
Document retrieval device
Aihara Kazuo,Ando Makoto,Hiraoka Naomi,Kawamoto Shinji,Kita Tatsuomi,Hiroko Matsuo,Yamaguchi Hiroshi,Akio Yamashita,辰臣 喜多,誠 安藤,明男 山下,浩 山口,真司 川本,直美 平岡,裕子 松尾,一雄 相原 +15 more
TL;DR: In this paper, the problem of the retrieval omission of a desired work and an unnecessary word at the time of thesaurus-developing an input keyword and setting it to be retrieval word and to realize efficient document retrieval is addressed.
Patent
Object classification researching device and program for executing it
Shinkichi Himeno,信吉 姫野 +1 more
TL;DR: In this paper, the authors proposed an object classification researching device consisting of an object input, an object record, and an object researching to extract a subset of the objects each having a high similarity to a given researching target object from the recorded objects.
Patent
Database managing method, device for executing the same, and recording medium on which processing program therefor is recorded
TL;DR: In this paper, the database managing method for managing a database to perform retrieving processing, has a step for generating an identification number for identifying data, which are the target of retrieving processing and another step for reading the contents of additional information corresponding to the generated identification number while referring to an additional information bit map storing the additional information showing whether the data exist in the database or not.