Public key cryptography is pretty pointless if you don’t take advantage of the public part. One, you can’t send me any encrypted messages without my public key.

Public key cryptography is pretty pointless if you don’t take advantage of the public part. One, you can’t send me any encrypted messages without my public key. Two, you can’t verify my signatures without my public key. Insecure algorithms are a red herring here too. Either I know what algo you used and can interact with you, or I don’t.