METHOD FOR GENERATING SECURE KEY USING CERTIFICATELESS PUBLIC KEY IN INSECURE COMMUNICATION CHANNEL

摘要

PURPOSE: A method for generating a security key using a certificateless public key in an unstable communication channel is provided to simply generate a security key by securing data based on a public key without a certificate. CONSTITUTION: A public key generator receives a message for requiring a private key and a public key from a first device(S1). The public key generator transmits the public key to the first device(S2). The public key generator receives authentication information and index of the first device from the first device(S3). The public key generator generates the public key and the private key of the first device(S4). The public key generator generates a temporary key(S5). The public key generator transmits the public key and the private key which are encrypted to the first device(S6). The public key generator calculates information about a valid status and the term of validity(S7). The public key generator transmits the information about the valid status and the term of validity which are calculated(S8).