Patent ID: 7630345

Claim:
An HRPD (High Rate Packet Data) network access authentication method based on a CAVE (Cellular Authentication and Voice Encryption) algorithm, comprising the steps of: generating, by an AT (Access Terminal), a random number “RAND” necessary for the CAVE algorithm, by using a CHAP (Challenge Handshake Authentication Protocol) challenge message; generating, by a removable UIM (User Identity Module) card, which includes the CAVE algorithm, a first result “AUTH1” that the removable UIM card works out by the CAVE algorithm by using said random number “RAND” in the removable UIM card; sending, by the AT, the AUTH1 by using a CHAP response message; generating, by an AN-AAA (Access Network-Authentication Authorization and Accounting) server that includes the CAVE algorithm, the random number “RAND” by using an access request message; generating, by the AN-AAA server, a second result “AUTH2” by using said random number “RAND”; and comparing the first and second results AUTH1 and AUTH2, and if AUTH1 and AUTH2 are equal, the AT passes an authentication.