Authenticating address ownership using care-of-address (COA) binding protocol

A method of authenticating address ownership using a Care-of Address (CoA) binding protocol includes: producing a random number, encrypting the random number using a secret key shared by a home agent (30) and a mobile node (10), piggybacking the encrypted random number in a binding acknowledge message, and transmitting the binding acknowledge message having the encrypted random number to the mobile node by the home agent upon the mobile node piggybacking a list of correspondent nodes requiring registration of a Care-of-Address (CoA) in a binding update message to register the CoA with the home agent and transmitting the binding update message having the list of correspondent nodes to the home agent; obtaining public keys of the corresponding correspondent nodes based on the list of correspondent nodes, encrypting first information required for authentication of the mobile node using the public keys, piggybacking the encrypted first information in data to be tunneled to the correspondent nodes (40), and transmitting the data having the encrypted first information to the correspondent nodes by the home agent ; and decrypting the first information received from the home agent using a secret key of the correspondent node and comparing the first information received from the home agent with a second information received from the mobile node to authenticate ownership of the corresponding mobile node by the correspondent node upon the mobile node piggybacking the second information required for ownership authentication in the binding update message to register the CoA with the correspondent node and transmitting the binding update message having the second information to the correspondent node.