Suppose that Alice signs the message M = "I love you" and then encrypts it with Bob's public key before sending it to Bob. As discussed in the text, Bob can decrypt this to obtain the signed message...

Suppose that Alice signs the message M = "I love you" and then encrypts it with Bob's public key before sending it to Bob. As discussed in the text, Bob can decrypt this to obtain the signed message and then encrypt the signed message with, say, Charlie's public key and forward the resulting ciphertext to Charlie. Could Alice prevent this "attack" by using symmetric key cryptography?