The aim of this paper is to describe a new vision for ATM Security Management that is proposed by the GAMMA project, and implemented by its "core" prototype called Security Management Platform. GAMMA is an FP7 project with the goal of developing solutions capable to manage emerging ATM vulnerabilities. The GAMMA vision recognises the opportunities opened by a collaborative framework for managing security, building a solution based on the self-protection and resilience of the ATM system, with the possibility to share security information in a distributed federated environment. This concept is implemented with the Security Management Platform prototype, and can be conceptualized as a network of distributed nodes embedded within the ATM system, providing interfaces to (ATM) internal and external security stakeholders. The Security Management Platform prototype provides a basis for the management of security throughout phases, from prevention to the identification of security incidents and the efficient resolution of the resulting ATM crises.