The increasing reliance on embedded systems for logistics management and fleet control demands secure communication, given the inherent computational constraints of these devices. This work comparatively implemented and analyzed three lightweight cryptographic ciphers: Speck, ChaCha20, and ECC to provide confidentiality to a fleet monitoring firmware. The analysis compared critical metrics, including memory usage, latency, and battery consumption. Each cypher was contrasted to the baseline, clear-text firmware version. The ChaCha20 algorithm provided the best cost-benefit ratio, with minimal latency overhead. In contrast, the ECC imposed the highest cost, with latencies exceeding 1.7 seconds, and the highest RAM/ROM memory overhead. The results confirm the viability of lightweight cryptography, providing an objective basis for upcoming design decisions aimed at achieving balanced performance and security in embedded logistics systems.