Abstract: A method of managing digital signature includes the steps of preparing a signature log file storing signature log entry information, generating a new digital signature for a transmission message by reflecting, in the new digital signature, signature log entry information registered to the signature log file in the past; generating signature log entry information associated with the new digital signature and registering the signature log entry information to the signature log file; and preparing a user search file in addition to the signature log file; registering, to the user search file, user identifier information indicating a transmission destination of the transmitted digital signature and a transmission source of the received digital signature, with a correspondence established between the information, the user identifier information, and each signature log entry information in the signature log file.

Abstract: The invention provides a method for verification having a structure that reflects reliability of a signature history properly for a hysteresis signature used for verification based on the signature history, and provides a method for arbitration and an arbitrator apparatus that solve a dispute on correctness of a signature based on the method for verification. Furthermore, the invention provides a method for managing history that mitigates the signature history management burden on a signer. Reliability is set on a signature forming record that is a component of a signature history, reliability of the signature history is calculated based on the set reliability, and the calculated reliability is output as reliability of a verification result. The invention provides a method for verification having a structure that reflects the reliability of a signature history properly and a method for arbitration and an arbitrator apparatus that solve a dispute on correctness of a signature.

Abstract: An electronic mall system is constituted of an ASP electronic mall and an ASP registration DB. Applications available for selection are represented as icons and a common execution screen is generated. The icons are linked with the ASP registration DB. The accounts are settled with each user and each ASP by measuring the application utilization time of the user and collating it with the ASP registration DB. A high-performance infrastructure environment is provided to support ASPs.

Abstract: A reliably safe storage system is provided which makes provable the status of a file stored in a storage server at a time specified by a user and creates evidence information that will be effective in future. In response to a file status fixing request from the user over a network, a storage server generates file fixing guarantee data, including data publicized by a publication server, and saves the generated data with the file associated with the generated data.

Abstract: A data distribution control system is provided, to which a terminal owned by a user, a plurality of computers for transmitting/receiving data, and a control apparatus for controlling data transmitted/received between the computers and the terminal are connected; in which the terminal-transmits first data to the control apparatus; when the control apparatus receives the first data, the control apparatus selects such a computer related to the terminal from the plurality of computers based upon the first data and-second data which includes attribute information previously registered in the control apparatus; the control apparatus transmits third data which contains positional information of the terminal and attribute information of the user with respect to the selected computer; and when the selected computer receives the third data, the selected computer transmits fourth data in order to call the user with respect to the terminal.

Abstract: To provide a verification record preservation function for keeping for a long time an evidential property of a verified signature to a user side apparatus and to provide services for insuring reliability of a signature of a user. A verification record preservation program creates a verification log recording a verification object signature, a signature log and a deposited publication signature log entry that are used for verification. A publishing organization side apparatus provides services that can reliably execute chain verification with reliability while taking convenience of users into consideration, such as a publication reminder service for preventing forgetfulness of publication, a publication notice for notifying publication of other user, verification vicarious execution for a user, and so forth.

Abstract: A method for signature verification having a structure that reflects reliability of a signature history properly for a hysteresis signature used for verification based on the signature history. A method for arbitration and an arbitrator apparatus solve a dispute on correctness of a signature based on the method for verification. Furthermore, a method for managing history to migrate the management burden on a signer. Reliability is set on a signature issuing record that is a component of a signature history, reliability of the signature history is calculated based on the set reliability, and the calculated reliability is output as reliability of a verification result. The disclosure also provides a method for verification that reflects the reliability of a signature history properly and a method for arbitration and an arbitrator apparatus that solve a dispute on correctness of a signature. Furthermore, a signature history storage service apparatus mitigates the signature history storage burden on a signer.

Abstract: Data protection techniques for preventing deletion, alteration, and leakage of data due to carelessness of a user and other programs (including a computer virus) and for preventing alteration of a program that uses the data are provided using a multi-OS control program, a host OS directly used by the user and a guest OS for managing files to be protected are run. A communication control program determines whether access from a signature request program can be performed or not, based on an access control list. In the case of access being authorized, a signature generation program is executed. The signature generation program generates a signature using a private-key. The communication control program sends back the generated signature to a requesting source through an inter-OS communication program.

Abstract: A reliably safe storage system is provided which makes provable the status of a file stored in a storage server at a time specified by a user and creates evidence information that will be effective in future. In response to a file status fixing request from the user over a network, a storage server generates file fixing guarantee data, including data publicized by a publication server, and saves the generated data with the file associated with the generated data.

Abstract: A method of managing digital signature includes the steps of preparing a signature log file storing signature log entry information, generating a new digital signature for a transmission message by reflecting, in the new digital signature, signature log entry information registered to the signature log file in the past; generating signature log entry information associated with the new digital signature and registering the signature log entry information to the signature log file; and preparing a user search file in addition to the signature log file; registering, to the user search file, user identifier information indicating a transmission destination of the transmitted digital signature and a transmission source of the received digital signature, with a correspondence established between the information, the user identifier information, and each signature log entry information in the signature log file.

Abstract: An electronic mall system is constituted of an ASP electronic mall and an ASP registration DB. Applications available for selection are represented as icons and a common execution screen is generated. The icons are linked with the ASP registration DB. The accounts are settled with each user and each ASP by measuring the application utilization time of the user and collating it with the ASP registration DB. A high-performance infrastructure environment is provided to support ASPs.