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This paper proposes new approaches to enhance the security of wireless sensor networks. Two randomized array transmission schemes are developed to secure wireless sensor networks at the physical layer. Transmission secrecy can be guaranteed by either the inherent ambiguities of MIMO blind equalization or the intentionally created ambiguities. Perfect secrecy is shown to be realizable under certain conditions. The schemes do not require secret keys, and work under more relaxed assumptions than existing techniques. They are useful for secure wireless data transmission or key distribution in wireless sensor networks.