Abstract: A verification system includes a server that includes a first processor configured to generate a hash value according to a first algorithm by using a public key associated with a user and a first message; and a terminal that includes a second processor configured to generate a collision generation value by a second algorithm based on the first message, a second message, and a private key that is paired with the public key so that the hash value is generated in a case where the collision generation value is input to the first algorithm together with the public key and the second message, and transmit the collision generation value and the second message to another terminal that is to be guaranteed that the second message has been provided by the user.

Abstract: A control method executed by a computer, the method including: detecting a risk to a first public key managed by a public key repository; performing update restriction of the first public key in response to the detection of the risk; authenticating an authenticator associated with the first public key; and releasing, in a case where the authentication of the authenticator succeeds, the update restriction.

Abstract: A control method implemented by a computer, the control method including: receiving, from a user, a usage instruction that instructs to use a first service; notifying first processing that provides the first service of identification information of a second service to which the user is logged in when the usage instruction is received; receiving a condition from the first processing according to the notification of the identification information; and instructing second processing that provides the second service to notify the first processing of information according to the condition.

Abstract: A verification method implemented by a computer, the verification method including: acquiring a transmission source of a transmitted target document and first signature pattern information that represents a feature of one or a plurality of signatures regarding the target document; extracting second signature pattern information associated with the acquired transmission source of the target document from a storage unit that stores signature pattern information that represents a feature of one or a plurality of signatures regarding a document acquired in the past in association with a transmission source of the document; and verifying reliability of the target document, based on a result of comparing the acquired first signature pattern information and the extracted second signature pattern information.

Abstract: A control method implemented by a computer, the control method including: receiving designation of data permitted to be accessed by a specific service, among data stored in a first storage; and in response to the receiving the designation of the data, outputting an instruction to store the designated data in a second storage isolated from the first storage.

Abstract: A generation method for a computer to execute a process includes acquiring data of a document that accepts input of signature by a plurality of users according to an attribute of the document; adding first information to the data, the first information indicating a plurality of areas in the document, the first information being used for specifying an order of requestee users of a procedure that involves the signature in a workflow regarding the document; and outputting the data of the document with the first information.

Abstract: A control method for a computer to execute a process includes detecting, by a first information processing device, a first data operation for a cloud service executed by an information processing system; notifying, by the first information processing device, a second information processing device of content of the first data operation; determining, by the second information processing device, to execute first processing on data that is a target of the first data operation based on the notified content of the first data operation; instructing, by the second information processing device, the first information processing device to execute the first processing; and executing, by the first information processing device, the first processing on the data when instructed to execute the first processing on the data.

Abstract: A control method implemented by a computer which is configured to be operated as a terminal apparatus, the control method including: transmitting, from the terminal apparatus to a first management server, a first request for transmission of a certificate of a first server, the first server being one of a plurality of servers, the first management server being configured to manage certificates for the plurality of servers; in response to the transmitting of the first request, receiving the certificate of the first server from the first management server; in response to the receiving of the certificate, determining a certificate authority by using information included in the received certificate, the certificate authority being a server from which the received certificate has been issued; and transmitting, from the terminal apparatus to the determined certificate authority, a second request for transmission of first address information on the first server.

Abstract: A signature control method implemented by a computer, the signature control method including: acquiring, by a processor circuit of the computer, a plurality of pieces of document information and signature information that corresponds to each piece of document information of the plurality of pieces of document information; generating, by the processor circuit of the computer, aggregate signature information obtained by aggregating the signature information that corresponds to the each piece of document information of the plurality of acquired pieces of document information on a basis of the plurality of acquired pieces of document information; and outputting, by the processor circuit of the computer, the generated aggregate signature information in association with aggregate public key information obtained by aggregating public key information that corresponds to the each piece of document information of the plurality of pieces of document information and the plurality of pieces of document information.

Abstract: A control method implemented by a computer, the method including: acquiring contract document data that includes a company name and a job title name of a person with an authority of a contract partner company; acquiring information that indicates a decision ability associated with the company name and the job title name included in the acquired contract document data, with reference to a storage unit that stores information that indicates a plurality of kinds of decision abilities for each job title of a company in association with the company name and the job title name; and presenting the acquired information that indicates the decision ability, in association with the acquired contract document data.

Abstract: A control method executed by a computer, the method includes receiving a program to identifiably display an authentication screen of a service transmitted from an authenticator in response to a reception of a first authentication request from a browser included in a terminal device to the authenticator, the browser displaying the authentication screen at the terminal device, and transmitting the received program to the terminal device.

Abstract: An authentication control device includes one or more memories, and one or more processors coupled to the one or more memories and the one or more processor configured to perform storing of a first authentication key received from a server device in the one or more memories, the first authentication key relating to a second authentication key stored in a terminal of a user, in communication between the authentication control device and the terminal in the state where the authentication control device is uncommunicable with the server device, in response to receiving, from the terminal, first information encoded in accordance with the second authentication key, perform decoding of the first information by the stored first authentication key, and execute an authentication process of the user in accordance with second information acquired by the decoding.

Abstract: An information processing apparatus includes: a memory; and a processor coupled to the memory and configured to: generate, when a browser is coupled to an authenticator, unique identification information by using information acquired from the browser; verify, by referring to a first list storing identification information of a browser permitted to be coupled, whether or not the identification information is stored in the first list, store a verification result in the memory while linking with the identification information, and transmit a verification completion notification to the browser; acquire, by receiving unique identification information generated by the authenticator using the information acquired from the browser, the verification result linked with the identification information from the memory; and transmit the acquisition result to the authenticator that controls coupling propriety with the browser.

Abstract: A key generation apparatus includes a memory, a communication interface, and a processor. The memory stores a first private key corresponding to a first public key. The communication interface communicates with a peer apparatus that stores the first public key. The processor generates a second public key and a second private key in response to a key update request from the peer apparatus, generates a digital signature by encrypting data including the second public key with the first private key, and sends a message including the data and the digital signature to the peer apparatus. In addition, the processor switches the first private key to the second private key.

Abstract: An access control device includes a processor configured to: receive a request for a connection via wireless communication from a terminal, issue a password from a first device for supporting a reading scheme for the terminal in response to a reception of the request for the connection, and transmit, to the terminal, a first program for generating a key information item of the terminal and acquiring authentication data corresponding to the password read by the reading scheme for the terminal, receive a response including the key information item and the authentication data from the terminal and determine whether the terminal is authorized based on the authentication data included in the response, and associate the key information item included in the response with identification information of the terminal and execute a process of establishing the connection to the terminal when the processor determines that the terminal is authorized.

Abstract: A control method implemented by a computer which is configured to be operated as a terminal apparatus, the control method including: transmitting, from the terminal apparatus to a first management server, a first request for transmission of a certificate of a first server, the first server being one of a plurality of servers, the first management server being configured to manage certificates for the plurality of servers; in response to the transmitting of the first request, receiving the certificate of the first server from the first management server; in response to the receiving of the certificate, determining a certificate authority by using information included in the received certificate, the certificate authority being a server from which the received certificate has been issued; and transmitting, from the terminal apparatus to the determined certificate authority, a second request for transmission of first address information on the first server.

Abstract: A control method executed by a computer, the method includes receiving a program to identifiably display an authentication screen of a service transmitted from an authenticator in response to a reception of a first authentication request from a browser included in a terminal device to the authenticator, the browser displaying the authentication screen at the terminal device, and transmitting the received program to the terminal device.

Abstract: An information processing device includes a memory; and a processor coupled to the memory and the processor configured to: acquire file data to be used by a terminal; generate multiple tallies from the file data; transmit at least one tally among the multiple tallies to an external device; generate attribute information including information of the file data and information of the external device; transmit, to the terminal, the generated attribute information and the multiple tallies except for the at least one tally transmitted to the external device; and transmit the attribute information to the external device.

Abstract: An information processing apparatus includes: a memory; and a processor coupled to the memory and configured to: generate, when a browser is coupled to an authenticator, unique identification information by using information acquired from the browser; verify, by referring to a first list storing identification information of a browser permitted to be coupled, whether or not the identification information is stored in the first list, store a verification result in the memory while linking with the identification information, and transmit a verification completion notification to the browser; acquire, by receiving unique identification information generated by the authenticator using the information acquired from the browser, the verification result linked with the identification information from the memory; and transmit the acquisition result to the authenticator that controls coupling propriety with the browser.

Abstract: A key generation apparatus includes a memory, a communication interface, and a processor. The memory stores a first private key corresponding to a first public key. The communication interface communicates with a peer apparatus that stores the first public key. The processor generates a second public key and a second private key in response to a key update request from the peer apparatus, generates a digital signature by encrypting data including the second public key with the first private key, and sends a message including the data and the digital signature to the peer apparatus. In addition, the processor switches the first private key to the second private key.