Patent ID: 7764949
Filing Date: 2010-07-27
Classification: H04L,H04W

Abstract:
1. A method of preventing a replay attack in a Mobile IPv6environment in a correspondent node, the method comprising: setting a Used field of a binding entry set for a mobile node to a predetermined value, if a binding life time of the mobile node is equal to 0 and a nonce generated for generating a previous binding management key for the mobile node is valid; searching, upon receipt of a binding update message from the mobile node or an attacker, a binding cache, and determining whether a binding entry, included in the binding cache, having the same Home Address (HoA) and Care of Address (CoA) as included in the binding update message exists; determining whether the Used field of the binding entry is equal to the predetermined value, if it is determined that a binding entry having the same HoA and CoA as included in the binding update message exists; and sending a reauthentication command message to the mobile node, if it is determined that the Used field of the binding entry is equal to the predetermined value.