Patent ID: 8711843

Claim:
A method implemented in a mobile node of generating a network address for communicating over an Internet Protocol (IP) network, the method comprising: generating a backward key chain containing a plurality of backward keys; generating a home address from a first backward key in said backward key chain; and generating a care-of address from a second backward key in said backward key chain preceding the first backward key to logically link said care-of address with said home address; and communicating with another network node over the communication network using the care-of address while the mobile node is in a visited network; and generating a second care-of address of the mobile node from a third backward key in said backward key chain preceding the second backward key to logically link said second care-of address with said home address; and discarding the first care-of address; and communicating with another network node over the communication network using the second care-of address while the mobile node is in a visited network; and wherein generating a backward key chain comprises recursively hashing a secret key to generate a series of backward keys.