Patent ID: 7869601
Filing Date: 2011-01-11
Classification: H04L,H04W

Abstract:
1. An authentication method of an ad hoc network that is configured by wireless communication terminals communicating with each other, wherein, when a first wireless communication terminal and a second wireless communication terminal conduct mutual authentication, the authentication method comprises: determining whether or not a common key that is commonly possessed by the first wireless communication terminal and the second wireless communication terminal exists; conducting, when a common key that is commonly possessed does not exist, a first mutual authentication using a public key, and effecting commonly possessing a common key by the first wireless communication terminal and the second wireless communication terminal, when both of the terminals having successfully completed the first mutual authentication; and conducting when a common key that is commonly possessed exists, a second mutual authentication between the first and the second wireless communication terminals with the common key; wherein, in the effecting commonly possessing the common key: when a common key does not exist in either the first wireless communication terminal or the second wireless communication terminal, the first wireless communication terminal generates a common key, and sends common key information including the common key to the second wireless communication terminal, when a common key exists in the first wireless communication terminal and a common key does not exist in the second wireless communication terminal, the first wireless communication terminal sends common key information including the common key to the second wireless communication terminal, and when a common key exists in the first wireless communication terminal and another common key also exists in the second wireless communication terminal, the first wireless communication terminal sends common key information including the common key that the first wireless communication terminal possesses to the second wireless communication terminal and the second wireless communication terminal sends common key information including the common key that the second wireless communication terminal possesses to the first wireless communication terminal.