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IDS techniques:. Collaborative - scales well with size of network. Active - takes preventive action with low response time. Security:. Uses strong cryptographic primitives for secure communication. Implemented in Java, code executes in sandbox. Communication:. Variety of communication protocols (TCP/UDP, overlay multicast, Java RMI). E-mail gateway enables admin to send patches to thousands of vulnerable machines instantly. Use existing work on overlay multicast mechanisms instead of reinventing the wheel.