Secure communication and preserving users’ anonymity and location privacy in hybrid ad hoc networks. Symmetric-key cryptography operations and payment system are used to secure route discovery and data transmission. To preserve users’ anonymity with low overhead, we develop efficient pseudonym generation and trapdoor techniques that do not use the resource-consuming asymmetric-key cryptography. Our analysis and simulation results demonstrate that our protocol can preserve privacy and secure the communication with low overhead. Our analysis and simulation results demonstrate that our protocol can preserve privacy and secure the communication with low overhead.