The document surveys the security challenges in Mobile Ad-hoc Networks (MANET), Vehicular Ad-hoc Networks (VANET), and Flying Ad-hoc Networks (FANET), highlighting the importance of secure communication due to the dynamic nature and open wireless medium of these networks. Key issues include active and passive attacks, key distribution, data consistency, and challenges related to high mobility and routing. Effective implementation of these networks is vital for enhancing user safety and optimizing the functionality of life-critical applications.