Abstract: Provided a first apparatus configured to, regarding a first sketch generated using first data and first biometric information and registered in advance, acquire anew first biometric information, generate second data, generate a third sketch using second data and the first biometric information acquired anew, acquire second biometric information, and generate a fourth sketch using the second data and second biometric information, and a second apparatus configured to restore difference data based on the first sketch and the third sketch generated by the first apparatus and generate a second sketch using the fourth sketch generated by the first apparatus and the difference data.

Abstract: A signature verification system 100 includes a signature apparatus 210 configured to sign data including a predetermined data block replaced with a chameleon hash value, using one or more public keys for changers authorized to change data, a changing apparatus 310 configured to receive the signed data, and to change a content of the predetermined data block of the signed data using a private key associated with any of the one or more public keys, and a verifying apparatus 410 configured to receive the signed data with the changed content of the predetermined data block, and to verify the signature using the one or more public keys for the changers.

Abstract: A similarity calculation system calculating a distance between a first vector stored in a similarity calculation apparatus and a second vector entered from an input terminal wherein the similarity calculation apparatus transmits to the input terminal a ciphertext of each element of the first vector and a weighted distance table with respect to combinations of possible values of the elements of the first vector and the second vector, and the input terminal refers to the weighted distance table to calculate a ciphertext of element distances for all combinations of the value of a single element of the second vector and possible values of elements of the first vector, calculates the ciphertexts of the sum of the element distances for each element of the second vector using additive homomorphic encryption, and transmits the ciphertext of the sum to the similarity calculation apparatus.

Abstract: A first apparatus generates a first sketch and first verification information for transmission to a third apparatus, a second apparatus generates a second sketch and second verification information for transmission to the third apparatus, which includes a storage part to store N set(s) of the first sketch and the first verification information, and upon reception of the second sketch and the second verification information, for the N set(s) of the first sketch and the first verification information, restore a difference key from the first sketch of kth (1?k?N) set and the second sketch to identify, as a user ID, an ID corresponding to the kth set of the first sketch and the first verification information, wherein a predetermined condition is satisfied for the first verification information of the kth set, the second verification information and the difference key.

Abstract: A conventional biometric authentication system has been time-consuming and labor-intensive for users since the users are requested to re-register their biometric information. According to an aspect of the present disclosure, a biometric authentication system includes an update value generation unit configured to generate an update value, a first update processing unit configured to update, using the update value, a template generated based on biometric information, and a second update processing unit configured to update, using the update value, a verification key generated along with the template based on the biometric information using the update value.

Abstract: A first signature generation apparatus generates a second distributed key and by using a second distributed key and third secret information and exchanging information with a second signature generation apparatus, generates a second distributed signature for a message. The second signature generation apparatus acquires second biometric information and restores second secret information using second biometric information and helper data, generates a first distributed key, and by using the first distributed key and the second secret information, and exchanging information with the first signature generation apparatus, generates the first distributed signature for the message, wherein one of the first signature generation apparatus or the second signature generation apparatus generates a signature for the message using the first distributed signature or the second distributed signature.

Abstract: A usage right verification system includes a content use means for using a content; a usage right presentation proxy means for storing a key parameter in association with a biometric information; and a content management means for storing a public key for digital signature information based on a biometric information. The content use means transmits the biometric information and a usage right information of the content to the usage right presentation proxy means. The usage right presentation proxy means generates digital signature information of the user based on the biometric information and the key parameter corresponding to the biometric information, and transmits signed usage right information in which the digital signature information has been added to the usage right information to the content management means. The content management means verifies the digital signature information of the user by using the corresponding public key based on the signed usage right information.

Abstract: In order to realize encryption processing capable of suppressing the degradation of collation accuracy and reducing the risk of information leakage, a terminal apparatus for encrypting input information to be input for collation is provided, the terminal apparatus being configured to perform transformation parameter generation processing for generating a transformation parameter based on a first parameter stored in a storage area and a second parameter that is different from the first parameter, and encrypt the input information input for collation using the transformation parameter to generate encrypted input information.

Abstract: An authentication system transmits a ciphertext of authentication information from an authenticatee apparatus to an authenticator apparatus using homomorphic encryption with a public key encryption scheme, the authenticator apparatus issues a first random number to the authenticatee apparatus, the authenticatee apparatus generates a second random number and transmits to the authenticator apparatus a first element generated with a public key using the first and the second random numbers and a second element generated with a public key using the second random number, and the authenticator apparatus modifies the second element using the first random number to obtain a ciphertext of the authentication information.

Abstract: The identification of a patient is checked more reliably.

Abstract: Provided is a registration information generation apparatus for generating registration information based on registration-side input information including one or both of elements corresponding to a first set and elements corresponding to a second set, the registration information generation apparatus being configured to generate intermediate information by performing distribution processing for performing secret-sharing for the elements corresponding to the first set in input information, and a duplication processing for duplicating the elements corresponding to the second set in input information, and generate the registration information by replacing a sort order of elements in the intermediate information using a replacement key.

Abstract: An information concealing system includes: an information concealing apparatus configured to generate a pseudo-random number, convert first information into first conversion information by using the pseudo-random number, and cause a concealment information generating unit to generate first concealment information capable to reconfigure the first information, based on the first conversion information; and an information reconfiguring apparatus configured to extract information related to a seed from the first concealment information, generate a reconfiguration-side pseudo-random number, based on the information related to the seed, convert input second information into second conversion information by using the reconfiguration-side pseudo-random number, and reconfigure the first information concealed as the first concealment information, based on the second conversion information and the first concealment information.

Abstract: An certificate issuer generates auxiliary data using a signing key and first biometric information, generates a certificate including a verification key corresponding to the signing key, and transmits the certificate and the auxiliary data to a certificate holder, which obtains the second biometric, receives the certificate and the auxiliary data transmitted from the certificate issuer, generates, using the second biometric information and the auxiliary data, a signature, and transmit a certificate presentation and the signature to a certificate verifier, which receives the certificate presentation and the signature from the certificate holder and verifies the signature using the verification key include d in the certificate.

Abstract: A first signature generation apparatus receives and registers first auxiliary data generated based on a first signature key and first biometric information and a second signature generation apparatus acquires second biometric information, generates a second distributed key, generates second auxiliary data using the second biometric information and the second distributed key and transmits a message and the second auxiliary data to the first signature generation apparatus, which generates a first distributed key using the first auxiliary data and the second auxiliary data, wherein the first and second signature generation apparatuses execute a distributed signing process using at least the first and second distributed keys to generate a signature for the message.

Abstract: A signature verification system includes: a signature apparatus configured to sign a first chameleon hash value, an unmodifiable part of the data, and a second chameleon hash value of an entirety of the data; a changing apparatus configured to change a public key for the changers of the temporary delegator to a public key for changers of an actual delegator, using a private key for the changers; a delegator changing apparatus configured to change a modifiable part of the data, using a private key for the changers of the actual delegator; and a verifying apparatus configured to verify the signature using the public key for the changers and the public key for the changers of the actual delegator.

Abstract: A collation system 10 includes divide registered information to first information and second information, and to provide the second information to a server apparatus 200, perform a first step for similarity calculation between the registered information and collation information inputted for collation with the registered information, based on the collation information and the first information, send a calculation result of the first step to the server apparatus 200, perform a second step for the similarity calculation based on the calculation result of the first step received from a client terminal 100, and the second information, send a calculation result of the second step to the client terminal 100, and perform a third step for the similarity calculation based on the calculation result of the second step received from the server apparatus 200, and the first information to calculate similarity between the registered information and the collation information.

Abstract: A matching system that uses a matching apparatus to match registered information input to a first transformation apparatus and matching information input to a second transformation apparatus, wherein the first transformation apparatus generates a registered feature vector from the registered information, generates a registered concealed vector through calculating a product of the registered feature vector and the registration key matrix by using a regular matrix selected at random as a registration key matrix, and transmits the registered concealed vector to the matching apparatus, the second transformation apparatus generates a matching feature vector from the matching information, generates a matching concealed vector through calculating a product of the matching feature vector and an inverse matrix of the registration key matrix, and transmits the matching concealed vector to the matching apparatus, the matching apparatus calculates an inner product of the registered concealed vector and the matching conce

Abstract: The client includes a random number generation unit which generates a random number, a concealed information storage unit which stores concealed information generated by concealing registered information and the generated random number using a secret key, and a response computation unit which, on the basis of a challenge transmitted from the server, the collation information input for collation with the registered information, and the concealed information, computes a response corresponding to the challenge and including a concealed index, generated by concealing an index indicating closeness between the registered information and the collation information. The server includes a challenge generation unit which generates the challenge using a public key corresponding to the secret key, and a determination unit which uses the public key and the random number transmitted from the client to determine whether or not the response transmitted from the client corresponds to the challenge.

Abstract: In order to provide an information concealing apparatus, an information reconfiguring apparatus, an information concealing system, an information concealing method, an information reconfiguring method, an information concealing program, and an information reconfiguring program to reduce information leakage risks, an information concealing system includes an information concealing apparatus, and an information reconfiguring apparatus. The information concealing apparatus generates a codeword capable of error-correcting concealment-side input information, generates noise including a predetermined error, and generates concealment information capable to reconfigure the concealment-side input information, by adding the concealment-side input information and the noise to the codeword. The information reconfiguring apparatus reconfigures the codeword from the concealment information, based on reconfiguration-side input information and the concealment information.

Abstract: In order to provide an information matching system achieving an information matching scheme that takes a lower cost and uses secure biometric information, the information matching system includes a concealment apparatus, a decryption apparatus, and a similarity calculating apparatus. The concealment apparatus transmits, to the similarity calculating apparatus, concealed information including information concealing obtained matching information by linear conversion using random numbers. The similarity calculating apparatus calculates, from obtained one or more pieces of registration information and the concealed information received from the concealment apparatus, a concealed similarity which is a value concealing a similarity between the matching information and the registration information, and to transmit the calculated concealed similarity to the decryption apparatus.