The use of the Internet must be able to be in confidence for users but security provisioning has a cost for ISPs 1. In a mobility context this security must be set up from scratch after each handover and for each customer. Therefore, a mechanism has been designed in the standardization bodies: the Context Transfer. This mechanism aims to transfer suitable information between equipments in order to reduce handover time. The benefit for an operator would then be a same security level during and after handover in mobile networks but with a cost as lower as possible. The purpose of this paper is to set out an application of the Context Transfer Protocol to IPsec 2 in a IPv6 mobile environment. After a state of the art of context transfer for security, the paper quickly presents CXTP 3 defined at the IETF 4. Then, it defines the IPsec context and finally, it describes a CXTP based solution to transfer this context between two access routers in a IPv6 mobility environment.

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Integrity checking is important in many activities, such as logistic, telecommunication or even day to day tasks such as checking for someone missing in a group. While the computing and telecommunication worlds commonly use digital integrity checking, many activities from the real world do not beneficiate from automatic mechanisms for ensuring integrity. We propose a spatial computing approach where groups of physical objects tagged with RFID chips are similar to network packets and group integrity can be checked at relevant places.