In wireless sensor networks, message authentication needs higher computation efficiency and lower communication cost since specific nodes are more vulnerable to various attacks due to the nature of wireless communication in public channel whereas sensor nodes are equipped with limited computing power, storage, and communication modules. Designated verifier signature scheme enables a signer node to convince the designated verifier that a signed message is authentic where neither the signer nor the verifier can convince any other party of authenticity of that message. In this paper, we explore a dual designated verifier signature scheme with message recovery for dual routing paths in a fault-tolerant manner. It supports the redundant routing path based message authentication under a dual route path to the goal base stations. The message is hidden in the signature that protects the privacy of both the sender's identity and message, thus only designated receivers can extract and verify the message. The proposed scheme can be applied to tiny and short signature requirements for lightweight message authentication in wireless sensor networks.