METHOD FOR MUTUAL AUTHENTICATING BETWEEN DEVICES USING MEDIATED MODULE AND SYSTEM THEREOF

摘要

A method and a system for performing mutual authentication between devices by using an intermediary module are provided to keep high security in mutual authentication between host and mobile devices by checking validity of a certificate from a CA(Certificate Authority) before verification of a sign value and separately verifying the sign value with the intermediary module. An interface(310) transfers various kinds of key information between a device storing a certificate received from a CA and a host device, and receives an updated certificate revocation list from the CA. A key storing part(320) stores a first partial private key divided from a first private key stored in the device and a second partial private key divided from a second private key stored in the host device. A controller(340) determines validity of a unique ID by receiving the unique ID/random number, which are detected from the certificate, for the device and the host device from the device. An electronic signer(330) generates first and second partial sign value s by using the first and second partial private keys when the unique ID is valid.