The document discusses collaborative security for protecting financial critical infrastructures. It describes how financial institutions are increasingly exposed to coordinated cyber attacks. It then introduces the CoMiFin platform, which uses semantic rooms to allow financial organizations to collaboratively monitor for threats, detect fraud, and share threat information in real time. Key features of the CoMiFin platform include its use of private and public cloud deployments, its complex event processing capabilities through tools like AGILIS and Esper, and its semantic rooms for detecting specific attacks like stealthy port scanning and correlating fraud events across organizations. The platform has received several awards and has been evaluated positively by major financial organizations for its potential business value.