<p>Data authentication is essential for modern security systems, as it ensures the integrity and authenticity of transmitted information. This work presents a novel way to data authentication that makes use of carrier-reservoir semiconductor optical amplifiers (CR-SOAs) and Mach–Zehnder Interferometers (MZIs). Utilizing CR-SOAs' special qualities to facilitate all-optical processing and optical signal amplification. The MZIs, integrated with CR-SOAs, provide the required phase modulation and signal routing for effective data authentication. In this study, we first use the SHA3-224 algorithm to convert the secured information into a fixed-size hash value. Next, we transmit the hash value using an encryption method. Using a decryption technique, we decrypt the encrypted information that was received at the receiving end. Then, we compare the decrypted information with the information that is being converted using the SHA3-224 algorithm from the original secured information. When the two values coincide, the information is regarded as genuine. On the other hand, a difference in the values suggests that the information has been altered. The operations of the circuit are theoretically described and proven through numerical simulation using Matlab. Benefits of the system include interoperability with current optical networks, minimal power consumption, and high-speed operation. Our findings demonstrate the significant potential of CR-SOA-based MZIs as a feasible tool for improving data authentication in security systems. As a result, the reliability and privacy of data in essential communication infrastructures can be significantly improved.</p>