Sending encrypted messages (ssh or scp)

ETC Homework & Coursework Questions
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  1. we are a group a students and we need a help for sending encrypted messages with unix (ssh or scp)

  2. we tried to use ssh and scp protocol but we didn't manage to send the message because we don't know the correct syntax of the command and we are asked a password and we don't know which is it

thank you for the attention (we need it as soon as possible because we are in troubles)
thank you again

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