Hi all,

I want to use openssl's subcommand rc4 to do encrypt and decrypt, but I failed using the
following command.

# openssl rc4 -K Key -in in.txt
iv undefined


What I think is I can use a key to encrypt plaintext in file in.txt and print out the cipher text. I will not direct use iv(initial vector), so I don't know why it prompt me the "iv undefined".

Could you tell me how to use openssl rc4 command to do that task?
Any help will be appreciated!

thanks,
-Derek
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