Abstract Scope |
As a data driven process, additive manufacturing (AM) is vulnerable to cyber-attacks, notably sabotage attacks that can impact part quality. Side-channel in-situ monitoring systems (SCISMS) are one approach that has been proposed for AM part verification. However, in order to protect these SCISMS from cyber-attacks, they should be air-gapped, preventing direct transmission of known-good quality information. This paper presents a method for embedding part quality information into an AM toolpath. Known-good information is transmitted via AM machine operation side-channels to the SCISMS, which compares transmitted known-good information to in-situ side-channel measurements for verification. To validate the approach, a case study is presented in which a material extrusion machine, wherein information is encoded as extruder movement speeds, transmits 10496 bits of part quality information to the SCISMS with an average rate of 7.1 bits per second. This information is then used to verify the machine state (position, temperature, extrusion) over time. |