| 摘要 |
A method for authenticating a ticket base on identification is provided to reduce an authentication time by minimizing the number of the communication between a user, a home authentication server, and an external authentication server. A user, a home authentication server and an external authentication server store password and a symmetric key of the user(S301). A user produces the OTP(One Time Password)(S302). The user encrypts ID, OTP, and AT of the user by using a symmetric key(S303). The user transmits the encrypted authentication message to the home authentication server(S304). The hone authentication server decodes the encrypted authentication message by using the symmetric key(S305). The home authentication server compares OTP' and OTP(S306). The home authentication server generates the secret information when the OTP' are equal to the OTP(S307). The home authentication server generates anonymous ID of the user(S308). The home authentication server issues the ticket(S309). The home authentication server encrypts the ticket issued by using the symmetric key(S310). The home authentication server transmits the encrypted ticket to the user(S311). The user decodes the encrypted ticket. The user stores the ticket(S312).
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