The aims of this project is the design and develop of a SoPC with two Ethernet ports able to cipher Ethernet frames attending to source and destination MAC addresses. Thanks to the proposed SoPC, it will be possible secure Ethernet point-to-point links through an insecure Ethernet network. This solution will enable an easy connection of distributed systems, like electronic ballot boxes, using the widely spread Ethernet standard. Thus, both the installer and the user will visualize the ciphering system like a black box with two Ethernet ports (input and output). Besides, thanks to the modularity of the proposed approach, the electronic designer could integrate the proposed SoPC in the CPU of the distributed device (i.e. electronic ballot boxes).