Hi! Could you please tell me what is the best way to use nacl.box, public key encryption in particular, if authentication isnt necessary? Who the sender is not important and people decrypting the message might not have sender public key available. what would be the most secure options in that case? is it okay to generate a random public private key pair just to use nacl.box and attach public key to the message for recipient to decrypt? the generated private key would not be used after that.