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Secret data matching device and secret data matching method
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A technology of secret data and matching devices, which is applied in digital data authentication, complex mathematical operations, calculations, etc., and can solve problems such as unsatisfactory diversity and unsatisfactory diversity
Active Publication Date: 2017-06-23
FUJITSU LTD
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[0010] However, schemes that implement relative key binding methods have the problem that these schemes cannot satisfy diversity, which is one of the security requirements for biological template protection.
That is, such a key binding scheme does not satisfy the diversity
[0011] The above problems occur not only in the matching of biological information, but also in the collation of numerical information such as location information and confidential information
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example 1
[0096] As an example, assume that the matching data Q1 of the first user input in the client terminal 2 when the matching is performed is [122,514,124].
[0097] The secret data matching device 3 receiving the matching request of the matching data Q1 from the client 2 sets each row vector V in the approximate determination matrix V 1 To V 5 . Then, the secret data matching device 3 calculates V 1 To V 5 The linear combination represented by the sum of products with each appropriate integer b 2 . Here, the linear combination b is expressed by the following expression (7) 2 .
[0099] Then, the secret data matching device 3 combines the calculated linear combination b 2 Send to client 2.
[0100] Receive linear combination b 2 The client 2 generates a secret vector H1, where two "0"s are appended to the vector (Q1,0,0) of the matching data Q1 with a linear combination b 2 Add to the product of random numbers. Here, when th...
example 2
[0108] As another example, assume that the secret data Q2 that is the biological data of the second user input in the client 2 when matching is performed is [121,555,123].
[0109] The secret data matching device 3 receiving the matching request of the matching data Q2 from the client terminal 2 sets each row vector V in the approximate determination matrix V 1 To V 5 . Then, the secret data matching device 3 calculates the vector V 1 To V 5 The linear combination represented by the sum of products with each appropriate integer b 2 . Here, the linear combination b is expressed by the above expression (7) 2 .
[0110] Then, the secret data matching device 3 combines the calculated linear combination b 2 Send to client 2.
[0111] Receive linear combination b 2 The client 2 generates a secret vector H2, in which two "0"s are appended to the vector (Q2,0,0) of the matching data Q2 with a linear combination b 2 Add to the product of random numbers. Here, when the random number r select...
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Abstract
The present disclosure relates to a secret data matching device and a secret data matching method. The secret data matching device according to the present invention registers the first secret vector obtained by hiding based on a first linear combination of a first random number and a row vector of an approximate determination matrix different for each system including the secret data matching device Biometric data and keys. The secret data matching means obtains the second secret vector obtained by hiding the matching data based on the second linear combination of the second random number and the row vector of the approximate determination matrix. The secret data matching means calculates a residual vector using the approximation determination matrix as a modulus from the difference between the first secret vector and the second secret vector, and determines whether the biological data and the matching data approximate each other based on the residual vector.
Description
Technical field [0001] The embodiments discussed herein involve secret data matching devices and the like. Background technique [0002] Biometric authentication is a personal authentication technology that uses human physical and behavioral characteristics. Examples of human physical characteristics include fingerprints, veins, iris, and DNA. Examples of behavioral characteristics include handwriting and the like. In biometric authentication, authentication is performed by collecting biometric information called a template in advance and comparing the biometric information with information acquired by a sensor when matching is performed. [0003] In recent years, attention has been paid to a biometric authentication technology in which a template converted to a certain extent is stored in a database and comparison is made without restoring the original template when matching is performed. The biometric authentication technology is called "biological template protection". In a ...
Claims
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