Abstract: A request verification system includes an authorization data generation apparatus, a verification apparatus, and a client apparatus. The authorization data generation apparatus stores a certificate including a public key and is configured to generate and output authorization data for authorizing a providing of a service. The verification apparatus is configured to share the certificate with the authorization data generation apparatus. The client apparatus is configured to use the provided service. In response to receiving a verification request of the authorization data from the client apparatus, the verification apparatus verifies the authorization data using the certificate.

Abstract: An authentication system includes a terminal having a transmitter, a processor, and a memory, and a server having a receiver, a processor and a memory. The terminal transmits request information to the server. The terminal acquires time information, generates a first one-time password at a pre-determined cycle by using the time information within the terminal, and generates encryption information which is acquired by encrypting the request information using the first one-time password as a key, the encryption information being transmitted from the terminal to the server. The server acquires time information within the server, generates a second one-time password at the pre-determined cycle as the cycle within the terminal by using the time information within the server, generates reference information which is acquired by decoding the encryption information using the second one-time password as a key, and compares the request information with the reference information.

Abstract: Provided is a terminal authentication system including a client terminal and a server device. The client terminal transmits first information based on secret information different for each client terminal and a client certificate including a hash value of the secret information which is derived from the secret information, to a server device. The server device receives the first information and the client certificate, derives a hash value from the secret information based on the first information using a unidirectional function, and authenticates the client terminal on the basis of the derived hash value and the hash value of the secret information which is included in the client certificate.

Abstract: An authentication system includes a terminal having a transmitter, a processor, and a memory, and a server having a receiver, a processor and a memory. The terminal transmits request information to the server. The terminal acquires time information, generates a first one-time password at a pre-determined cycle by using the time information within the terminal, and generates encryption information which is acquired by encrypting the request information using the first one-time password as a key, the encryption information being transmitted from the terminal to the server. The server acquires time information within the server, generates a second one-time password at the pre-determined cycle as the cycle within the terminal by using the time information within the server, generates reference information which is acquired by decoding the encryption information using the second one-time password as a key, and compares the request information with the reference information.

Abstract: Provided is an authentication system in which a client terminal that receives input of request information is connected to a server that executes a process with regard to the request information. The client terminal includes: a first authentication information generation unit that generates first authentication information based on information which is shared with the server; an encryption unit that generates encryption information; and a transmission unit that transmits the request information and encryption information to the server.

Abstract: Provided is a signature verification system including a communication device and a verification device. The communication device and the verification device are connected to each other through a network. The communication device derives a first hash value from a first random number, derives a second hash value from data including electronic data and a certificate of the communication device which includes the first hash value and a public key of the communication device, using a unidirectional function, generates a signature using a secret key of the communication device with respect to the second hash value, and transmits the electronic data, the certificate, and the signature to the verification device.

Abstract: Provided is a certificate issuing system including a client terminal and a server device. The client terminal derives a first hash value from a first random number using a unidirectional function, generates a secret key and a public key of the client terminal, and transmits the first hash value and the public key of the client terminal to the server device. The server device receives the first hash value and the public key of the client terminal from the client terminal, stores the first hash value, authenticates the client terminal on the basis of the stored first hash value and the derived first hash value, generates a client certificate on the basis of the public key of the client terminal and a secret key of the server device when the authentication succeeds, and transmits the client certificate to the client terminal.

Abstract: Provided is a signature verification system including a communication device and a verification device. The communication device and the verification device are connected to each other through a network. The communication device derives a first hash value from a first random number, derives a second hash value from data including electronic data and a certificate of the communication device which includes the first hash value and a public key of the communication device, using a unidirectional function, generates a signature using a secret key of the communication device with respect to the second hash value, and transmits the electronic data, the certificate, and the signature to the verification device.

Abstract: Provided is a terminal authentication system including a client terminal and a server device. The client terminal transmits first information based on secret information different for each client terminal and a client certificate including a hash value of the secret information which is derived from the secret information, to a server device. The server device receives the first information and the client certificate, derives a hash value from the secret information based on the first information using a unidirectional function, and authenticates the client terminal on the basis of the derived hash value and the hash value of the secret information which is included in the client certificate.

Abstract: Provided is a certificate issuing system including a client terminal and a server device. The client terminal derives a first hash value from a first random number using a unidirectional function, generates a secret key and a public key of the client terminal, and transmits the first hash value and the public key of the client terminal to the server device. The server device receives the first hash value and the public key of the client terminal from the client terminal, stores the first hash value, authenticates the client terminal on the basis of the stored first hash value and the derived first hash value, generates a client certificate on the basis of the public key of the client terminal and a secret key of the server device when the authentication succeeds, and transmits the client certificate to the client terminal.

Abstract: Provided is an authentication system in which a client terminal that receives input of request information is connected to a server that executes a process with regard to the request information. The client terminal includes: a first authentication information generation unit that generates first authentication information based on information which is shared with the server; an encryption unit that generates encryption information; and a transmission unit that transmits the request information and encryption information to the server.