In modern computational environments, safeguarding sensitive data and preventing unauthorized access require robust and efficient authentication mechanisms. This paper presents a secure authentication protocol that addresses two key objectives: validating user legitimacy prior to network access and maintaining data integrity and confidentiality during transmission. The proposed scheme leverages lightweight cryptographic techniques including hashing, encryption, and dynamic pseudonyms to ensure mutual authentication and secure session key exchange, while preserving user anonymity and preventing identity tracking. The protocol includes a secure initialization phase, user registration, and a Mutual Authentication and Key Exchange (MAKE) process, effectively countering common threats such as replay attacks, impersonation, and man-in-the-middle attacks. Designed for low-power and resource-constrained environments, the protocol minimizes computational overhead without compromising security. Comparative analysis with existing schemes demonstrates that the proposed method achieves a strong balance between security, efficiency, and scalability, making it highly suitable for modern distributed network architectures.