Security deperimeterisation is at the heart of plans that underpin the Cabinet Office's high-profile transformational government programme, delegates at the Infosecurity Conference will be told today. Increasing demands for public sector bodies to exchange information and share IT services will mean that traditional approaches to security will no longer be appropriate, the Cabinet Office's security adviser will say. Steve Marsh, director of the Central Sponsor for Information Assurance, said that a new security architecture would play a key role in the transformational government plan.