Question: In a crypto system, one user encrypts a message and sends to another user. Which of the following must be a secret ( not seen

In a crypto system, one user encrypts a message and sends to another user. Which of the following must be a secret

(

not seen by attackers

) ?

encryption method, and decryption method. The key, and the plaintext the plaintext, encryption method, and decryption method. The key, the plaintext, encryption method, and decryption method. The key, encryption method, and decryption method.

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