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While trying to convert private key into public key i get this error message.
I used "openssl genrsa -des3 -out private.key 4096" to generate the private key and used "openssl -in private.key -pubout -out public.key" to generate the public key.
what went wrong,why do I get this error
This happened because openssl tool syntax requires a command name as the first parameter. In your case it should be
openssl rsa -in private.key -pubout -out publickey.out
Notice the rsa command name.
