Streams, security and scalability. Theodore Johnson, S. Muthukrishnan, Oliver Spatscheck and Divesh Srivastava. Network-based attacks, such as DDoS attacks and worms, are threatening the continued utility of the Internet. As the variety and the sophistication of attacks grow, early detection of potential attacks will become crucial in mitigating their impact. We argue that the Gigascope data stream management system has both the functionality and the performance to serve as the foundation for the next generation of network intrusion detection systems.