SEARCH SYSTEM AND METHOD IN MULTI-USER

摘要

PURPOSE: A search system between multi users for an encryption document and a method thereof are provided to search and transmit an encryption document related to a keyword of a user and decrypt the document by an encryption key, thereby preventing data tapping. CONSTITUTION: A user list managing unit(210) manages a second secret key including the identification information of a user and a first secret key. A key generating unit(230) generates a first generation key for generating a document encryption key and a second generation key for generating a keyword index generation key using a random number and the second secret key received from a user terminal. A data searching unit(240) generates the keyword index generation key based on a query value and the second secret key received from the user terminal and searches an encrypted document corresponding to the keyword index generation key.