When sending messages using symmetric encryption, which of the following must happen FIRST?
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A. B. C. D.C.
Symmetric encryption is a technique where the same secret key is used for both encryption and decryption of the message. Before sending a message using symmetric encryption, the following steps must happen in the order listed below:
Agree on an encryption method: Both the sender and receiver must agree on an encryption method. This includes selecting a specific algorithm for encryption/decryption, and also choosing the key length, mode of operation, and any other necessary parameters.
Exchange encryption key: The sender and receiver must exchange the secret key that will be used for encryption and decryption of the message. This key must be kept secret and secure from unauthorized access. This can be done in a variety of ways, such as through a secure channel or by using a key exchange algorithm.
Establish digital signatures: If needed, the sender can establish a digital signature to ensure the authenticity and integrity of the message. This is done by using a public key encryption technique where the sender's private key is used to create a digital signature, and the receiver's public key is used to verify the signature.
Send the encrypted message: Finally, the sender can encrypt the message using the agreed-upon encryption method and the shared secret key. The encrypted message can then be sent to the receiver.
In summary, agreeing on an encryption method must happen first when sending messages using symmetric encryption, followed by exchanging the encryption key, establishing digital signatures (if needed), and then sending the encrypted message.