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The low-cost, off-the-shelf hardware components in unshielded sensor-network nodes leave them vulnerable to compromise. With little effort, an adversary may capture nodes, analyze and replicate them, and surreptitiously insert these replicas at strategic locations within the network. We propose two new algorithms, Randomized Multicast and Line-Selected Multicast, based on emergent properties to defend against these attacks. We also leverage these techniques to design, implement, and evaluate a new secure routing protocol for sensor networks. Our protocol requires no special hardware and provides message delivery even in an environment with active adversaries. We adopt a clean-slate approach and design a new sensor network routing protocol with security and efficiency as central design parameters. As a result, our protocol is efficient yet highly resilient to active attacks.