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-f output_keyfileunnecessary.-a 100have any value at all with an empty passphrase? It seems that such a key is still trivially brute-forceable (try nothing -- and it works!)-awith an empty passphrase. This seems senseless, but I may be uneducated in this regard.-a 1000 -N ''and there was no delay. With-a 1000 -N 'x'there is a delay. Conclusion:-awith-Nhas no effect.-C <comment>to add the service name that this key is being generated for... because [best practice] we all generate different keys for each service, right?