Patent ID: 7594114
Filing Date: 2009-09-22
Classification: H04L

Abstract:
1. An authentication method for communication between a first device and a second device over a network carrier, said authentication method comprising: determining whether a message from the second device is in a proper format for authentication; encoding, in response to the message from the second device, a first authentication value upon receipt of the message, the first authentication value encoded with a first encryption key; calculating a first cyclic redundancy check value of the message upon receipt of the message; sending the encoded first authentication value to the second device; decoding, in response to a reply from the second device, a second authentication value upon receipt of the reply if the reply is received within a predetermined time after sending the encoded first authentication value, the second authentication value decoded with a second encryption key; comparing the first and second authentication values to determine the authenticity of the reply; extracting a second cyclic redundancy check value from the reply; and comparing the second cyclic redundancy check value from the reply against the first cyclic redundancy check value of the message.