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by nelop
168 days ago
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There are lots of ways to solve this problem. In the past I have worked in defence, for highly sensitive stuff they wouldn't even allow a common ground between two networks. That's why I chose an option iolsator, it ensures the two devices are electrically isolated. It's overkill for this application, but I wanted to set something up right, and if I ever have another project like this that needs to be more secure, it's ready to go. |
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I actually agree very much with this. If you're looking for strong assurance that there is no possible back-channel, devices like optocouplers help significantly. It's not hard for me to think of a way to surreptitiously send data backwards through a common ground, or normal silicon diode, or a magnetic coupler like an Ethernet transformer, but optoisolators make it significantly more challenging.