Secret data matching device, secret data updating method, and recording medium

Abstract

The invention provides a secret data matching device, a secret data updating method, and a recording medium. The secret data matching device includes a memory unit for storing a first secret vector obtained by concealing a first data set and a key data using a determination matrix; an obtaining unit for obtaining a second secret vector by concealing a second data set using the determination matrix; a calculating unit for calculating a residue vector which is a residue when the determination matrix is a modulus, from a difference between the first and second secret vectors; a determination unit for determining whether the first and second data sets are approximate based on the residue vector; an extracting unit for extracting the key data from the residue vector when the first data set and the second data set are approximate; a creating unit for generating a third secret vector by combining the key data and the second secret vector; and a storing unit for storing the third secret vector.

Description

technical field [0001] Embodiments discussed herein relate to a secret data matching device, a computer-readable recording medium storing a program for updating secret data, and a secret data updating method. Background technique [0002] Biometric authentication is a technology capable of individual authentication using information on a person's physical characteristics and behavioral characteristics. Human physical features include, for example, fingerprints, veins, irises, and faces. Behavioral traits include, for example, handwriting and gait. Biological information called a template is obtained in advance, and authentication is performed by comparing the obtained biological information with information obtained by the sensor during matching. [0003] Recently, a biometric authentication technique has been known in which a template subjected to some type of conversion is stored in a database and used for comparison without restoring the original template obtained durin...

AI Technical Summary

Problems solved by technology

[0008] However, there is a problem that biometric information cannot be updated securely or easily in the conventional technology for realizing the key binding method

[0009] For example, when performing a method for repeating the process used in the initial registration, since the user goes to a location dedicated to registration of biological information at a fixed cycle or whenever there is an indication that the degree of similarity has decreased and is repeatedly used to obtain biological information process, so the server cannot easily update biometric information

[0010] Vague Promise and Vague Safe involve sending unhidden biometrics to the server during enrollment so that the server cannot securely update biometrics

[0011] Although unconcealed biological information is not transmitted to the server during registration or matching in the key binding method using lattice element addition, the server cannot easily update the biological information because the process of initial registration is repeated

[0012] The above-mentioned problems are not limited to updating biological information, and the same problems also occur when updating digital information such as location information or confidential information

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