Patent ID: 8635443
Filing Date: 2014-01-21
Classification: H04W

Abstract:
1. A method for Challenge Handshake Authentication Protocol, CHAP, authentication over a Code Division Multiplex Access Evolution to packet Data Optimized, EVDO, network, comprising: receiving a CHAP authentication request, carrying a first key value, which is transmitted from an authentication server; invoking a Message Digest 5, MD5, authentication method to calculate a first authentication key value from the first key value upon determining that an identifier of supporting the MD5 authentication method is stored in a user identity module, and transmitting the first authentication key value to the authentication server for authentication; and invoking a Cellular Authentication and Voice Encryption. CAVE, authentication method to calculate a second authentication key value from a second key value upon reception of a CHAP re-authentication request, carrying the second key value, which is returned from the authentication server after failing in authentication with the first authentication key value, and transmitting the second authentication key value to the authentication server for authentication.