Information processing system and information processing method

The system addresses security and privacy concerns in information retrieval by using homomorphic encryption to perform secure and accurate similarity searches on encrypted data, improving search accuracy and confidentiality.

JP2026104713APending Publication Date: 2026-06-25FUJITSU LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
FUJITSU LTD
Filing Date
2024-12-13
Publication Date
2026-06-25

AI Technical Summary

Technical Problem

Existing information retrieval systems like RAG and searchable encryption face challenges in ensuring security and privacy while maintaining search accuracy, particularly in handling query confidentiality, data confidentiality, and advanced natural language searches.

Method used

An information processing system and method that utilizes homomorphic encryption to vectorize and encrypt data and queries, allowing secure and accurate similarity searches by performing operations directly on encrypted data without decryption, using a system comprising a provider terminal, searcher terminal, and an information retrieval server to manage encrypted indexes and queries.

Benefits of technology

Enhances search accuracy while ensuring the security of information by maintaining confidentiality of search keywords, index content, and supporting advanced natural language searches through secure homomorphic operations.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention provides an information processing system and method that improve search accuracy while ensuring the security of information. [Solution] The provider terminal device generates an index by vectorizing multiple provided data into vectors and encrypting them using homomorphic encryption, generates multiple encrypted data by encrypting multiple provided data, and sends a search table in which the index and encrypted data are registered in association to the information retrieval server 1. The searcher terminal device sends a search query to the information retrieval server 1, which is a vectorized vector of query information used for the input search and encrypted using homomorphic encryption. The information retrieval server 1 performs homomorphic operations on the search query and the index registered in the search table according to the homomorphic encryption, creates a similarity list, and sends it to the searcher terminal device. The searcher terminal device extracts similar indexes similar to the search query based on the similarity list.
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