BLACK HAT USA — Las Vegas — Security researchers who built a phony engineering workstation that was able to dupe — and alter — operations of the Siemens S7 programmable logic controller (PLC) found that modern S7 PLC families running the same firmware also share the same public cryptographic key, leaving the devices vulnerable to attacks like the ones they simulated. “All PLCs of the same model have the same key, which means if you crack one, you’ve cracked all of them,”

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