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Can I save space for short messages by using encryption with private key instead of a signature?
From what I read here: crypto.stackexchange.com/questions/2123/… it is possible, but made no sense according to the 3th post, but from what I see, it makes sense (like discribed in my post). So from what you say, you really should sign and not encrypt decrypt. Is there a way using other key pairs to encrypt/decrypt?