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Ensuring the integrity of embedded programmable logic controllers (PLCs) is critical for safe operation of industrial control systems. In particular, a cyber-attack could manipulate control logic running on the PLCs to bring the process of safety-critical application into unsafe states. Unfortunately, PLCs are typically not equipped with hardware support that allows the use of techniques such as remote attestation to verify the integrity of the logic code. In addition, so far remote attestation is not able to verify the integrity of the physical process controlled by the PLC.