Cloud can provide great flexibility to IT, ensuring business continuity and optimizing costs. But what are the implications for IT security? Even big names such as IEEE, Apple and Samsung are among the victims of identity theft in the Cloud. If you choose to adopt virtual data center (IaaS) or on-line applications (SaaS), you shift the paradigm of security as it was conceived up to now. The presentation will examine the security implications of a Cloud infrastructure and possible remedies with practical examples.