See, a blocker and a sniffer would have almost entirely opposite functions. Both are cool devices that could be built from essentially the same hardware, so you do have a point there, but I wouldn't combine the two. Too easy to end up doing the wrong thing and compromising your data.
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USB data blocker - totally awesome idea. It could double as a protocol sniffer if it had a buffer.
See, a blocker and a sniffer would have almost entirely opposite functions. Both are cool devices that could be built from essentially the same hardware, so you do have a point there, but I wouldn't combine the two. Too easy to end up doing the wrong thing and compromising your data.