Question: We can create an authenticated encryption scheme by using a symmetric cipher and a digital signature scheme. What is the best way of doing so?

We can create an authenticated encryption scheme by using a symmetric cipher and a digital signature scheme. What is the best way of doing so?

1: Encrypt the message using the symmetric cipher, then sign the plaintext

2: Encrypt the message using the symmetric cipher, then sign the ciphertext

3: Sign the message, then encrypt message concatenated with the signature using the symmetric cipher

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