/Method for double encryption of private key and sending/receiving the private key for transportation and roaming service of the private key in the public key infrastructure

摘要

PURPOSE: A double encoding and transmitting/receiving method for a private key movement and roaming service in a public key based configuration is provided to draw out a private key through a stable communication channel by doubly encoding and entrusting a user's private key to a roaming service center. CONSTITUTION: A user firstly encodes one's private key as a password using a personal computer(S101). The user requests a roaming service center to authenticate a public key(S102). A roaming service center authenticates the user and issues a note of authentication(S103). The user secondly encodes a public key of the roaming service center(S104). The user transmits an identification authenticated by the roaming service center to a server of the roaming service center(S105). The server of the roaming service center stores an N value, a second encoded private key, and identification(S106). When the user requests the roaming service center to draw out a private key, the server of the roaming service center forms a stable communication channel, and requests the user to input the identification and a password. The user inputs and transmits the identification and the password to the roaming service center. The server of the roaming service center detects the identification which the user inputs and detects the second encoded private key from a double encoded private key.