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One of the main issues in MANET is security. Since MANET characteristics are dynamic, it make vulnerable to various severe attacks. Cryptography can provide a strong solution for most vulnerability. Various approaches are discussed in the literature review. From them, ID-based cryptography and key management approaches are utilized for reducing the cost and time. This paper presents a UDRPG -[Unique-Dynamic-Random-Password-Generation] method to generate unique IDs for entire nodes in the network. Each node should submit their unique random key while communication in the network. The simulation results show that UDRPG can give better results than the existing approaches.