The document describes a proposed system for secure and efficient data transmission in cluster-based wireless sensor networks. It proposes two protocols, SET-IBS and SET-IBOOS, that use identity-based digital signatures for security. SET-IBS relies on the Diffie-Hellman problem while SET-IBOOS relies on the discrete logarithm problem. The proposed protocols aim to reduce computational overhead for security compared to existing approaches. Simulations show the proposed protocols have better performance in terms of security overhead and energy consumption.