visible , verifiable key exchange unit , using the Trusted Root Certification Authorities visible verifiable key exchange system , the method and medium

摘要

A visibly verifiable key exchange apparatus, a visibly verifiable key exchange system using a reliable authentication agent, and a method and recording medium thereof are provided to secure the anonymity of a user ID by using a picture of the user as the user ID. A visibly verifiable key exchange method includes the steps of: transmitting an encrypted picture of a user to a terminal of the other user(310), and receiving the encrypted picture of the other user from the terminal of the other user(320); and if the user and the other user check the picture of a counterpart(330), applying a session key which is generated by using the pictures of the user and the other user to the communication between the terminal of the user and the terminal of the other user(340). The communication applying step includes the steps of: displaying the picture of the counterpart on the terminal of the user and the terminal of the other user; and if a check button is pushed, deciding that the user and the other user check the picture of the counterpart.