# US 11,115,214 B2 · Biometric signature system and biometric signature method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,115,214 B2 - Document ID: US11115214B2 - Status: Granted - Kind: B2 - Application number: 16/491,129 - Filed: 2018-02-14 - Published: 2020-01-09 - Granted: 2021-09-07 - Earliest claimed: 2017-06-09 - Assignees: Hitachi, Ltd. - Applicants: Hitachi, Ltd. - Inventors: Yosuke Kaga; Kenta Takahashi; Masakazu Fujio - Web page: https://patentgrep.com/patent/US11115214B2 ## CPC - H04L 9/3231: {Biological data, e.g. fingerprint, voice or retina (network architectures or network communication protocols for supporting authentication of entities using biometrical features in a packet data network H04L63/0861)} - G06F 21/32: using biometric data, e.g. fingerprints, iris scans or voiceprints - G06F 21/64: Protecting data integrity, e.g. using checksums, certificates or signatures - G06V 40/1347: {Preprocessing; Feature extraction} - G06V 40/1365: {Matching; Classification} - H04L 9/0866: {involving user or device identifiers, e.g. serial number, physical or biometrical information, DNA, hand-signature or measurable physical characteristics} - H04L 9/3247: {involving digital signatures} - G06V 40/14: Vascular patterns - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING ## Abstract A biometric signature system holds a first template indicating a result of transforming, by predetermined transformation, first biometric information acquired from a predetermined part of a user; and a second template indicating a result of transforming, by predetermined one-way transformation, second biometric information acquired from the predetermined part of the user, identifies a parameter for which a similarity between the first template of the person to be authenticated corrected, generates a second template of the person to be authenticated from each piece of corrected second biometric information, and determines whether authentication of the person to be authenticated is successful by comparing each generated second template with the second template. ## Claims ### Claim 1 A biometric signature system, comprising a processor and a memory, the memory being configured to hold: a first template indicating a result of transforming, by predetermined transformation, first biometric information acquired from a predetermined part of a user; and a second template indicating a result of transforming, by predetermined one-way transformation, second biometric information acquired from the predetermined part of the user, the processor being configured to: acquire the first biometric information and the second biometric information from a person to be authenticated; generate a first template of the person to be authenticated from the acquired first biometric information; identify a parameter for which a similarity between the first template of the person to be authenticated corrected by using the parameter and the first template held in the memory is larger than a predetermined condition; correct the second biometric information on the person to be authenticated by using each parameter included in a predetermined range including the identified parameter; generate a second template of the person to be authenticated from each piece of corrected second biometric information; and determine whether authentication of the person to be authenticated is successful by comparing each generated second template with the second template held in the memory. ### Claim 2 (depends on 1) The biometric signature system according to claim 1, wherein the processor is configured to generate the first template of the person to be authenticated by transforming the acquired first biometric information by the predetermined transformation. ### Claim 3 (depends on 1) The biometric signature system according to claim 1, wherein the processor is configured to generate the second template of the person to be authenticated by transforming each piece of corrected second biometric information by the predetermined one-way transformation. ### Claim 4 (depends on 1) The biometric signature system according to claim 1, wherein a correlation coefficient between the first biometric information and the second biometric information, which are stored in the memory, is equal to or smaller than a predetermined value. ### Claim 5 (depends on 1) The biometric signature system according to claim 1, wherein the parameter includes a parameter indicating a parallel translation amount in correction of the first template and the second template, and a parameter indicating a rotation amount in the correction. ### Claim 6 (depends on 1) The biometric signature system according to claim 1, wherein the memory is configured to hold respective first templates and second templates of a plurality of users, and wherein the processor is configured to: identify a group of users corresponding to a first template having the parameter for which the similarity is larger than the predetermined condition among the first templates held in the memory; for each user of the identified group of users, use each parameter included in the predetermined range including the identified parameter to correct the second biometric information on the person to be authenticated, to thereby generate a second template; and compare each generated second temple with a second template of the each user; and determine whether authentication of the person to be authenticated is successful based on a comparison result for each user of the identified group of users. ### Claim 7 A biometric signature method by a biometric signature system, the biometric system being configured to hold: a first template indicating a result of transforming, by predetermined transformation, first biometric information acquired from a predetermined part of a user; and a second template indicating a result of transforming, by predetermined one-way transformation, second biometric information acquired from the predetermined part of the user, wherein the biometric signature method includes: acquiring, by the biometric signature system, the first biometric information and the second biometric information from a person to be authenticated; generating, by the biometric signature system, a first template of the person to be authenticated from the acquired first biometric information; identifying, by the biometric signature system, a parameter for which a similarity between the first template of the person to be authenticated corrected by using the parameter and the first template held in the biometric signature system is larger than a predetermined condition; correcting, by the biometric signature system, the second biometric information on the person to be authenticated by using each parameter included in a predetermined range including the identified parameter; generating, by the biometric signature system, a second template of the person to be authenticated from each piece of corrected second biometric information; and determining, by the biometric signature system, whether authentication of the person to be authenticated is successful by comparing each generated second template with the second template held in the biometric signature system. ### Claim 8 (depends on 7) The biometric signature method according to claim 7, includes generating, by the biometric signature system, the first template of the person to be authenticated by transforming the acquired first biometric information by the predetermined transformation. ### Claim 9 (depends on 7) The biometric signature method according to claim 7, includes generating, by the biometric signature system, the second template of the person to be authenticated by transforming each piece of corrected second biometric information by the predetermined one-way transformation. ### Claim 10 (depends on 7) The biometric signature method according to claim 7, wherein a correlation coefficient between the first biometric information and the second biometric information, which are stored in the biometric signature system, is equal to or smaller than a predetermined value. ### Claim 11 (depends on 7) The biometric signature method according to claim 7, wherein the parameter includes a parameter indicating a parallel translation amount in correction of the first template and the second template, and a parameter indicating a rotation amount in the correction. ### Claim 12 (depends on 7) The biometric signature method according to claim 7, wherein the biometric signature system is configured to hold respective first templates and second templates of a plurality of users, and wherein the biometric signature method includes: identifying, by the biometric signature system, a group of users corresponding to a first template having the parameter for which the similarity is larger than the predetermined condition among the first templates held in the biometric signature system; for each user of the identified group of users, using, by the biometric signature system, each parameter included in the predetermined range including the identified parameter to correct the second biometric information on the person to be authenticated, to thereby generate a second template; and comparing, by the biometric signature system, each generated second temple with a second template of the each user; and determining, by the biometric signature system, whether authentication of the person to be authenticated is successful based on a comparison result for each user of the identified group of users.