Abstract: A method for screening a functional material according to the present invention comprises steps of: treating a linker material-coated substrate with a capture protein; treating the capture protein-treated substrate with a functional material candidate; treating the functional material candidate-treated substrate with biotin-conjugated IgE; and treating the biotin-bound IgE-treated substrate with fluorescently labeled streptavidin.

Abstract: A method for distributively managing the CRL in a certifying system to certify the validity of a subscriber in an open communications network such as Internet, includes the steps of registering the certificate policy statement for the CRL by determining the distribution interval of the CRL; setting the structure of the certificate of the subscriber to issue the certificate according to the registered certificate policy statement; attesting the certificate by applying the distribution point mechanism according to the distribution interval to the CRL; and revoking the certificate by using the distribution points to revise the CRL displayed.

Abstract: A method of providing a time stamping service for setting a client's system clock, wherein the client's system clock can be set to reliable standard time. Whether the client's system clock has been accurately set is one of the preconditions for the smooth provision of a public key infrastructure-based security service. A service provider providing the public key infrastructure-based security service safely receives reference time information from an objectively reliable third-party system, sets the client's system clock on the basis of the received reference time information and provides the security service on the basis of the set client's system clock. Therefore, the service provider can smoothly provide the security service while assuring the accuracy and reliability of the client's system clock. Further, the smooth provision of the security service can reduce the number of petitions from clients to the security service, thereby increasing the quality of the security service.

Abstract: A method for distributively managing the CRL in a certifying system to certify the validity of a subscriber in an open communications network such as Internet, includes the steps of registering the certificate policy statement for the CRL by determining the distribution interval of the CRL; setting the structure of the certificate of the subscriber to issue the certificate according to the registered certificate policy statement; attesting the certificate by applying the distribution point mechanism according to the distribution interval to the CRL; and revoking the certificate by using the distribution points to revise the CRL displayed.

Abstract: A method of providing a time stamping service for setting a client's system clock, wherein the client's system clock can be set to reliable standard time. Whether the client's system clock has been accurately set is one of the preconditions for the smooth provision of a public key infrastructure-based security service. A service provider providing the public key infrastructure-based security service safely receives reference time information from an objectively reliable third-party system, sets the client's system clock on the basis of the received reference time information and provides the security service on the basis of the set client's system clock. Therefore, the service provider can smoothly provide the security service while assuring the accuracy and reliability of the client's system clock. Further, the smooth provision of the security service can reduce the number of petitions from clients to the security service, thereby increasing the quality of the security service.

Abstract: Disclosed is a system for providing a sender certification service based on an end-to-end (EtoE) message security and public key infrastructure (PKI) between mobile terminals. The system performs by proxy a verification work of the user's certificate that is difficult to be performed by the mobile terminal having a limited capacity. The system performs by proxy a certification removal list (CRL) check and a certificate validity check with respect to the certificate sent by a sender, and thus the mobile terminal having the limited capacity can directly use the certificate without any CRC check or validity check of the sender's certificate, and effectively perform the PKI based electronic certification service. The system can be usefully applied to all fields that require a PKI based certification security service in the radio network environment in that messages are transmitted/received between the mobile terminals.