Fujitsu Corporation

Yuka Jo

Takahiro Aoki

Takahiro Saito

Soichi Hama

Mitsuaki Fukuda

Masaya Yasuda

Genta Suzuki

A 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.

Secret data matching device, computer-readable recording medium storing program for updating secret data, and secret data updating method

A concealed data matching method for a computer including: registering a first concealed vector obtained by concealing registered data and key data based on a first random number and a linear combination of row vectors of a determination matrix; acquiring a second concealed vector; calculating a remainder vector indicating a remainder obtained by dividing the difference between the first concealed vector and the second concealed vector; determining the similarity between the registered data and the matching data based on the remainder vector; extracting the key data from the remainder vector if it is determined they are similar; calculating an inter-vector distance between the registered data and the matching data; and determining the similarity between the registered data and the matching data based on the magnitude of the inter-vector distance.

Concealed data matching device, concealed data matching program, and concealed data matching method

A vein authentication device converts pixel values of an image, which captures an authentication site including veins, into frequency components. Moreover, the vein authentication device performs filtering of the frequency components, which are obtained by conversion of the pixel values, using a filter stored in a filter storing unit for reducing frequency components, from among low-frequency components having a lower spatial frequency than the spatial frequency of the veins and high-frequency components having a higher spatial frequency than the spatial frequency of the veins, corresponding to surface reflection of an illumination used for the authentication site. Furthermore, the vein authentication device converts the frequency components, which are subjected to filtering, back into an image. Moreover, the vein authentication device extracts vein data representing a vascular pattern of veins from the image obtained by reverse conversion. Furthermore, the vein authentication device performs vein authentication using the vein data that is extracted.

Vein authentication method, image processing method, and vein authentication device

An information terminal includes acquiring an image of a first subject that is captured by a first sensor provided on a back surface of a surface on which a screen of the information terminal is disposed, and when displaying the image on the screen, changing a degree of scaling up/down of the image and a position at which the image is displayed in accordance with a position of a second subject that is imaged by a second sensor provided to the information terminal.

Recording medium, image processing method, and information terminal

A secret data matching device includes: a memory; and a processor coupled to the memory. The processor executes a process including: storing a first secret vector obtained by concealing first data and key data based on a first random number and a first linear combination of row vectors of a determination matrix which is different for each system including the secret data matching device and which is generated by attaching a random number vector as a last column to a matrix including diagonal components including a threshold value to determine whether the first data and second data are approximate to each other and a threshold value related to the key data; acquiring a second secret vector obtained by concealing the second data based on a second linear combination of row vectors of the determination matrix and a second random number.

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

A biometric authentication device that authenticates a user using biological features of the user, the biometric authentication device includes: an illumination unit configured to illuminate a target which represents the biological features; an image sensor configured to obtain a first captured image by capturing the target illuminated by the illumination unit, and obtain a second captured image by capturing the target not illuminated by the illumination unit; an acquisition unit configured to acquire from a storage unit a mask which has a target area approximating the shape of the target in the first and second captured images obtained by the image sensor; and a detection unit configured to detect light other than illumination light illuminated by the illumination unit based on the mask acquired by the acquisition unit and at least one of the first and second images.

Biometric authentication device, biometric authentication program, and biometric authentication method

A biometric authentication device includes, an acquisition unit configured to repeatedly image a biological part of an authenticated person while changing a relative position with respect to the biological part so as to acquire time-series biological images; a detection unit configured to detect a pixel corresponding among the biological images from the time-series biological images; an extraction unit configured to extract a pixel of which a pixel value includes a surface reflection component from the biological part, from each of the time-series biological images, on the basis of a degree of divergence of temporal variation of a pixel value of the detected pixel in the time-series biological images from an estimation result of temporal variation; a generation unit configured to correct the pixel value of the extracted pixel on the basis of a pixel value; and an authentication unit configured to perform personal authentication of the authenticated person.

Biometric authentication device and method

A biometric-information processing device includes an image acquisition unit configured to acquire an image of a biometric object using light reflected from the biometric object. The biometric-information processing device further includes an extracting unit configured to extract a frequency component having a frequency higher than a predetermined spatial frequency at the image acquired by the image acquisition unit.

Biometric-information processing device, method of processing biometric information, and computer-readable recording medium storing biometric-information processing program

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Kawasaki, Japan

Yuka Jo