Abstract: A mandate processing device includes: a mandator setting unit, a mandate content setting unit, and a mandatary setting unit, which serve as a first presentation unit that, when a mandate is to be issued from a mandator to a mandatary, presents, as first input candidates, mandate information candidates, which can be determined based on user information of the mandator and the mandatary; a mandate condition setting unit serving as a second presentation unit that presents, as second input candidates, mandate condition candidates, which are the mandate information candidates other than the first input candidates and which are candidates for a mandate condition defined by the mandator as a condition for the mandatary; and a mandate information registration unit that registers mandate information which is information selected from the first input candidates and the second input candidates and for performing the mandate.

Abstract: A verification system that verifies certificate information including attribute information indicating an attribute of a user and information for verification related to verification of a qualification of the user, the verification system including a specifying unit that specifies a format of the certificate information, an extraction unit that extracts the information for verification from the certificate information based on a result of specification performed by the specifying unit, a concealment unit that conceals a predetermined portion including the attribute information of the certificate information to generate concealed attribute information, and a verification unit that performs verification based on the information for verification extracted by the extraction unit and the concealed attribute information generated by the concealment unit.

Abstract: A matching support system matches clients and service providers. The system stores information about service, request information received from a client of the service, reliability information indicating a degree of reliability of the providers, and information indicating expertise of the providers. The matching support system determines a difficulty level of the request based on the request information, extracts candidates of the providers of the service from the basic information to extract the provider having a higher reliability for the request having a higher difficulty level, and generates a first extraction result. The support system extracts candidates of the providers of the service from the first extraction result to extract the provider having higher expertise in the service for the request having a higher difficulty level, and generates a second extraction result. Thereby, the matching support system presents, to a user, candidates of the providers based on the second extraction result.

Abstract: A mandate processing device includes: a mandator setting unit, a mandate content setting unit, and a mandatary setting unit, which serve as a first presentation unit that, when a mandate is to be issued from a mandator to a mandatary, presents, as first input candidates, mandate information candidates, which can be determined based on user information of the mandator and the mandatary; a mandate condition setting unit serving as a second presentation unit that presents, as second input candidates, mandate condition candidates, which are the mandate information candidates other than the first input candidates and which are candidates for a mandate condition defined by the mandator as a condition for the mandatary; and a mandate information registration unit that registers mandate information which is information selected from the first input candidates and the second input candidates and for performing the mandate.

Abstract: A user attribute information provision system processes attribute information of users while preventing a leakage of attribute information. A provision apparatus: selects an apparatus group forming a communication path; generates information registration request in which information of a predetermined user is concealed in data recognizable only to a correspondent of the provision apparatus; and transmits the information registration request to an access destination solving apparatus via the apparatus groups.

Abstract: With a portal server, a request for information from a terminal of a second user that is an agent for a first user is received, and an encrypted data directed to a terminal of the first user, stored in an encrypted-data memory unit, is re-encrypted using a re-encryption key for the second user, stored in a first encryption-key memory unit, and is transmitted to the terminal of the second user, with the terminal of the second user, the re-encrypted data received is decrypted using an encryption key for the second user, stored in a second encryption-key memory unit, and time keys specified by the terminal of the first user, related to a time-period during which browsing of the information is permitted.

Abstract: A data authenticity assurance method carried out by a management computer including: a first step of receiving the first data piece from the computer; a second step of selecting a plurality of second data pieces at predetermined intervals in chronological order from among the plurality of second data pieces held in the data holding part; a third step of performing an arithmetic operation for each of the hash values of the selected plurality of second data pieces; a fourth step of generating signature target data by combining the first data piece received from the computer with the hash values of the selected plurality of second data pieces; and a fifth step of generating a second data piece by assigning the digital signature to the signature target data by using the preset key, and holding the generated second data piece in chronological order sequentially in the data holding part.

Abstract: A user attribute information provision system processes attribute information of users while preventing a leakage of attribute information. A provision apparatus: selects an apparatus group forming a communication path; generates information registration request in which information of a predetermined user is concealed in data recognizable only to a correspondent of the provision apparatus; and transmits the information registration request to an access destination solving apparatus via the apparatus groups.

Abstract: With a portal server, a request for information from a terminal of a second user that is an agent for a first user is received, and an encrypted data directed to a terminal of the first user, stored in an encrypted-data memory unit, is re-encrypted using a re-encryption key for the second user, stored in a first encryption-key memory unit, arid is transmitted to the terminal of the second user, with the terminal of the second user, the re-encrypted data received is decrypted using an encryption key for the second user, stored in a second encryption-key memory unit, and time keys specified by the terminal of the first user, related to a time-period during which browsing of the information is permitted.

Abstract: A data authenticity assurance method carried out by a management computer including: a first step of receiving the first data piece from the computer; a second step of selecting a plurality of second data pieces at predetermined intervals in chronological order from among the plurality of second data pieces held in the data holding part; a third step of performing an arithmetic operation for each of the hash values of the selected plurality of second data pieces; a fourth step of generating signature target data by combining the first data piece received from the computer with the hash values of the selected plurality of second data pieces; and a fifth step of generating a second data piece by assigning the digital signature to the signature target data by using the preset key, and holding the generated second data piece in chronological order sequentially in the data holding part.