Patent ID: 8000704

Claim:
A method of reducing the number of messages required for a visiting mobile node to access a network through an access network utilizing Internet Protocol version 6 (IPv6), the method comprising: receiving at an access router of the access network, an attachment request message from the mobile node, the request message including: a mobile node identifier; the mobile node's public key; an Interface Identifier part of an IPv6 address for the mobile node without a prefix part of the IPv6 address, wherein the Interface Identifier part of the IPv6 address is created by the mobile node, which verifies its ownership of the Interface Identifier through Cryptographically Generated Addresses (CGA); an address of the mobile node's Home Agent; a cookie calculated in a manner known only to the mobile node; and a signature signed with the mobile node's private key; verifying by the access router: that the mobile node is authorized to use the access network; that the mobile node is authorized to use the Home Agent; and that the Interface Identifier is available in the access network; creating by the access router, the prefix part of the mobile node's IPv6 address; and sending an acknowledgment message from the access router to the mobile node granting access to the network, the acknowledgment message including: the cookie from the mobile node; an identifier and a public key of the access router; a signature of the access router; and one or more signed statements indicating that a signer has registered the mobile node's request, and that the signer has verified that the access network is trusted.