As the demand for secure communication and data integrity in embedded and networked systems continues to grow, there is an increasing need for cryptographic solutions that provide robust security while efficiently using energy and hardware resources. Although software-based implementations of SHA-3 provide design flexibility, they often struggle to meet the performance and power limitations of constrained environments. This study introduces a hardware-accelerated SHA-3 solution tailored for the Xilinx Artix-7 FPGA. The architecture includes a fully pipelined Keccak-f [1600] core and incorporates design strategies such as selective loop unrolling, clock gating, and pipeline balancing to enhance overall efficiency. Developed in VHDL and synthesised using Vivado 2024.2.2, the design achieves a throughput of 1.35 Gbps at 210 MHz, with a power consumption of 0.94 W—yielding an energy efficiency of 1.44 Gbps/W. Validation using NIST SHA-3 vectors confirms its reliable performance, making it a promising candidate for secure embedded systems, including IoT platforms, edge devices, and real-time authentication applications.