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We introduce the secure service overlay network based on enhanced Lamport signature. Firstly, we propose the enhanced Lamport signature supporting node authentication by making relation between node ID and Lamport signature's key pair. Then, we show how secure service overlay network can be built based on the proposed enhanced Lamport signature. For this, we propose two different approaches. Through simulations with various service cases, we check the application possibility of two different approaches with various one-way hash functions and encryption algorithms.