Living body authtentication system

• US 20020150283A1
• Filed: 05/22/2002
• Published: 10/17/2002
• Est. Priority Date: 05/31/2000
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Mimura, Masahiro, Seto, Yoichi, Ishizuka, Takuo
• Granted Patent: US 7,162,058 B2
• Time in Patent Office: Days
• US Class Current: 382/124
• CPC Class Codes: G06Q 20/341 Active cards, i.e. cards including their own processing means, e.g. including an IC or chip
• CPC Class Codes: G06Q 20/40145 Biometric identity checks
• CPC Class Codes: G06V 40/1365 Matching; Classification
• CPC Class Codes: G07C 9/257 electronically G07C9/26 takes precedence
• CPC Class Codes: G07C 9/29 the pass containing active electronic elements, e.g. smartcards
• CPC Class Codes: G07F 7/1008 Active credit-cards provided with means to personalise their use, e.g. with PIN-introduction/comparison system

Abstract

A fingerprint identification system comprising: an IC card having a tamper-resistance; and a reader/writer having a tamper-resistance for reading/writing information from/into the IC card. In the reader/writer, a fingerprint image, as read by a fingerprint input unit, is preprocessed in a preprocessing unit, and extracted intermediate information is transmitted to the IC card. This IC card compares the intermediate information with the fingerprint information, and makes authentication information usable for an electronic authentication upon matching. By this electronic authentication with applications, the fingerprint identification system, which has a high level of safety and can reduce the cost is provided.

Claims

1. A biometric authentication system comprising:

a mobile storage device with a computing function having a tamper-resistance; and

a reader/writer having a tamper-resistance for reading/writing information from/into said mobile storage device,

wherein said reader/writer includes;

a biological information input device for inputting biological information,

preprocessing the biological information inputted by said biological information input device, and

transmitting intermediate information thus preprocessed to said mobile storage device, and

wherein said mobile storage device includes a template of biological information and a secret key to be used for electronic authentication;

compares said intermediate information with said template; and

makes said secret key available upon a match after comparing.

2. A biometric authentication system according to claim 1,

wherein,

said biological information is fingerprint information,

said reader/writer transmits, sequentially to said mobile storage device, a fingerprint image information necessary for a fingerprint identification, and

said mobile storage device performs the fingerprint identification by processing said fingerprint image information sequentially.

3. A biometric authentication system according to claim 1,

wherein,

said biological information is fingerprint information,

information for correcting a positional displacement between a registered fingerprint recorded in said template and an input fingerprint that is newly inputted is calculated by using a core position of the fingerprint,

a small image in the vicinity of a featuring point of said registered fingerprint is retrieved by performing matching in the vicinity of coordinates of an image of said inputted fingerprint, the positional displacement of the coordinates having been corrected, and

said fingerprint image is determined to be identical to said template according to the number of matched small images.

4. A biometric authentication system according to claim 3,

wherein,

a normal vector of a ridge is retrieved, and

a position where said normal vector largely changes is determined as a core of the fingerprint.

5. A biometric authentication system according to claim 1,

wherein,

said biological information is fingerprint information,

information for correcting a positional displacement between a registered fingerprint recorded in said template and an input fingerprint that is newly inputted is calculated by forming images having specific luminance distributions in the peripheries of individual featuring points with regard to the input fingerprint and the registered fingerprint, and by correlating said images therebetween,

a small image in the vicinity of a featuring point of said registered fingerprint is retrieved by performing matching in the vicinity of coordinates of an image of said inputted fingerprint, the positional displacement of the coordinates having been corrected, and

said fingerprint image is determined to be identical to said template according to the number of matched small images.